[Replacing Caster and her Master]

Fuyuki Fire Park [Free]

Second Child [Free]

Command Seals [Free]

Magic Circuits [Free] {20 Circuits}

Stat Sheet [Free]

Basic Training [Free]

The Most Remixable Song [Free]

More Powerful Servant [300cp]

Best Girl [Free with Second Child]

Good People Have Good Night's Sleep [Free for Second Child]

Mystical Leach [-200cp with Discount for Second Child]

I am No One's Tool [-300cp with Discount for Second Child]

Black Grail [-500cp with Discount for Second Child]

Impeccable Recommendation [Free for Second Child]

Worm Slut [+100cp]

Sealing Designation [+200cp]

Appearance: He originally had black hair and blue eyes, which turned to violet hair and eyes during the training tha Zouken gave both him and Sakura. When he was tossed aside and the pieces of the black grail fused with him, his hair turned white and his eyes turned red, giving him a similar look to an Einzbern Homunculus, unlike them though, he has scarring across his body because of the worms and has a much weaker physical body than what he should have for his age and build. He is taller than everyone else in his family clocking in at 187cm. He weighs 74kg. He prefers to wear darker colors like greys, blacks, and blues. He prefers to keep his hair cut short.

Servant: Irisviel von Einzbern

Caster [-275sp]

Strength: E

Endurance: D [-50sp]

Agility: B [-50sp]

Mana: A+ [-50sp]

Luck: B

Catching Up [Free with Servant]

Dragonheart [-300cp]

Item Construction: A [-125sp]

Territory Construction: A [-125sp]

Magic Resistance: D [-100sp]

Goddess's Divine Core: C [Free]

Resolute Devotion: A [-250sp]

Child of Nature: A [-250sp]

Healing Magecraft: A [-250sp]

Song of Grail: A [-50sp]

What Spiritual Form? [+50sp]

Mana Muncher [+100sp]

Independent Action: A [+125sp]

Prologue: Seals Upon This Hand Of Mine

My name was once Toma Tohsaka, it became Toma Matou, but now… now I was just Toma Hashimoto. I was not originally Toma though for this was not my first life. As one can imagine, childhood was not fun for someone mentally much older than a child. My childhood this time around was much worse. I was the twin to Sakura and the youngest of the three Tohsaka children. While the knowledge of my previous life made me very much aware of where I am and what I was dealing with, I was still vastly underprepared for what would happen to me. While I displayed myself as a very intelligent child, I wasn't nearly as talented as Rin, and that led to me being adopted by Zouken Matou with Sakura, as a 'backup' in case something happened to Sakura who would become the 'heir' of the matou family.

If you have watched Fate/Zero, you might have an understanding of what I had gone through during my childhood. Once the grail war was over, I was used as a test subject for Zouken while he was trying to implant pieces of the black grail inside of people. I was the disposable test subject, one used to make sure that Sakura would survive the process. I got lucky and something went horribly right. Maybe I had blown up or my body was breaking down, but one experiment caused the near death and destruction of my body. Something that was enough for Zouken to just toss my body aside carelessly.

I had woken up changed. My hair was white and my eyes red. I looked like a Homunculus. My rebirth had come with some perks though. I had some knowledge on the basics of magecraft. Nothing that I could really use when I was younger as my birth parents hadn't put in the effort to awaken my circuits, and I definitely couldn't use while I was being torture by Zouken. I was… broken, to say in the least for years after that, I apparently had great skill in Hypnosis and used it to avoid the government from being suspicious about a child living on their own. I also used it to make people give me the cash they had in their wallets or purses. I trained and studied and did my best to figure out how to use the abilities granted to me by the black grail. Not only did I have great regenerative powers, I could create and manipulate black mud from the grail into any shape that I wanted. From what I remember of Heaven's Feel, I could also drain spiritual beings, corrupt servants and make them loyal to me, break people's minds, and create familiars and warriors using the black mud that I create. I could also increase the amount of Black mud I can create and manipulate by expending prana.

I was frustrated because I couldn't help out my sister because of Zouken and what he has done to her. I couldn't really go to Rin either as she was a magus and I had pieces of a corrupted Holy Grail implanted and merged into my body. I would get a sealing designation as soon as someone figured that out.

Eventually I ended up enrolling myself to the same school as all the main characters under the name Toma Hashimoto, the name that I was using now. I got my education and I made sure to protect Sakura where I could. This may or may not have included setting up an 'accident' so that Shinji would lose his dick, or occasionally trip down some stairs. For the most part, I was by myself. I couldn't really approach Sakura without possibly alerting Zouken to my survival, the man was older than I and really hard to kill. I couldn't mess up Shinji with magic all too much either unless I wanted to alert Zouken before I was strong enough to survive on my own.

As years passed, I made sure to help Sakura where I could and I steered her towards Shirou earlier, allowing her to have a friend much earlier than just one year before the next Holy Grail war. She was a bit more broken because she believed that I had died.

I did well enough in my classes, but I was certainly not at the top of my classes, but I was up there. I focused a lot of my time on practicing and improving my control over the black mud and what little magecraft I knew. Eventually, before I knew it, the Holy Grail war was happening. I woke up with command seals on the back of my hand. Whelp, might as well summon my servant

"Silver and iron to the origin. Gem and the archduke of contracts to the cornerstone. The ancestor is my great master Schweinorg.

The alighted wind becomes a wall. The gates in the four directions close, coming from the crown, the three-forked road that leads to the kingdom circulate.

Shut (fill). Shut (fill). Shut (fill). Shut (fill). Shut (fill).

Repeat every five times.

Simply, shatter once filled.

――――I announce.

Your self is under me, my fate(doom) is in your sword.

In accordance with the approach of the Holy Grail, if you abide by this feeling, this reason, then answer.

Here is my oath. I am the one who becomes all the good of the world of the dead, I am the one who lays out all the evil of the world of the dead.

You, seven heavens clad in three words of power, arrive from the ring of deterrence, O keeper of the balance ―――!"

I performed the summoning ritual in the middle of my apartment. I made sure to move everything out of the way. I was using my body as the catalyst because of the grail shards in my body. Once the ritual was complete my servant appeared kneeling before me.

"Servant Caster at your service! Are you the one who summoned me?" I was stunned at the person before me. I had summoned Irisviel von Einzbern. That shouldn't be possible… Well I did have the shards of the holy grail that she was the lesser grail of… that and if EMIYA was summoned as well, I guess that this should be possible.

Irisviel poked me on the cheek. "Are you the Einzbern master? You look like my darling Illya and myself."

"Uh… no, sorry. I am not the Einzbern master. My name is Toma Hashimoto, it's nice to meet you Irisviel von Einzbern."

"It will be nice to work with you as well Master!"

"So, I think that there are a couple of things that we need to talk about, Caster"

"And what is that Master?"

And like that, I explained to her about this being my second life, the corruption of the grail, what I knew about possible upcoming events, and about Sakura. I asked her about her Noble Phantasm and if that would be able to help fix Sakura from the crest worms inside of her. Caster was unsure, but was willing to give it a try, and would supplement it with the healing magecraft that she knew. She wasn't combat focused at all as a servant, so I would probably have to corrupt one of the servants to help us fight. She wasn't the happiest about that, but she agreed. She was especially looking forward to having Illya show up in about a year. She also wants me to kill the priest dude even if there was a Gilgamesh in the way, I told her no for now as he could possibly end up helping my sister, and that by the time the war ends, we could kill him. She also wants to kill Zouken Matou, something that was definitely on the agenda. That seems to satisfy her for now. She was also very excited at the prospect of Shirou and immediately wanted to adopt him.

Apparently she couldn't go into spirit form, so we had to hash out how she would 'fit' into my life. In the end, it was decided that in public, she would be my "mom".

I had to spend a lot of time convincing Irisviel to not up and immediately adopt Shirou and rescue Illya. Summoning so early was very anomalous and I really didn't want a sealing designation on my ass right now because of the attention that would get me. We also immediately got to work on removing the worms from my own body, something I was glad to get rid of.

(There was nothing in the drawback that made them permanent, while implied, it is not directly stated and therefore can be rid of with the right tools, Sakura is the only one who has a worm by her heart, the worms my character has are more similar to the ones that Psycho priest was able to get rid of. Considering the servant I have as well, well there is no way that I would die from doing so, and if I get crippled? I can recover from nearly anything already, including being cut in half or other lethal blow to humans)

[1 year later] {5 days before Shirou summons Saber}

According to Caster, most of the servants have been summoned at this point. Minus 2 of them, which should be Archer and Saber, if my knowledge is still correct. With Irisviel and I replacing the original Caster pair, I was completely unsure of how things would develop. I don't know when the other servants would be summoned, but today, Caster and I would be going to the Einzbern's manor in the woods.

I made sure to be prepared to run the fuck away if things went south. During the walk there, we passed through several bounded fields. They definitely knew that we were coming. We arrived at the entrance to see Illya at the entrance with Berserker next to her. Caster immediately bolted to Illya and hugged her. Illya was understandably shocked as her mother was apparently a servant. There was a lot of crying. I stayed away from Berserker. Illya invited us into the manor, not separating from her mom, her mom wasn't leaving her either. She invited us to stay at the manor. She also held tightly onto her mother's hand, as if she would disappear if she let go. I couldn't really blame her. Lunch was nice, and we talked a bit, I mostly let Irisviel and Illya catch up and talk. I got permission to go to the library, with supervision, and see if there is anything that could help me. I found a couple of books on non-alchemical magecraft. I started to study structural grasping and a couple of weak elemental spells. Irisviel stayed with her daughter for the whole day and would continue to stay with her for the rest of the night. I couldn't blame either of them. I was given one of the guest rooms. I guess that we would probably be forming an alliance or something like that. I wonder how we would prevent Illya from becoming the grail as she was the lesser grail. Worst comes to worst, I corrupt servants and prevent her from getting their souls or whatever. Not sure though if I would be able to sustain that many servants though, while I have more mana/prana/od than my actual servant who has rank A+ in mana, and without the worms in my body constantly draining itI would easily be able to sustain a good number of servants, after the war though? No idea, Sakura was able to do so with Medusa, so I should be able to do it with Irisviel and maybe another. That and from what I know, my prana/mana/od reservoir can increase if I eat powerful magic stuff or people.

[The next day] {4 days until saber is summoned}

So I was now officially in an alliance with the Einzberns. We would work together in the grail war until we are the last 2 master/servant pairs standing. Illya was a surprisingly cheerful person for what could possibly happen to her. I told her about another person who I wanted to recruit/save. We sat and discussed what we wanted to do about the situation, should we do that now? Later? How would we go about this? What to do about Zouken Matou?

We eventually decided that we would kidnap her temporarily and use a combination of Irisviel's Noble Phantasm and her healing magecraft to remove all of the worms from her body, including the one by her heart. We would have to convince Rider that this is in Sakura's best interests. Berserker would provide a distraction and attack the Matou's home and try to exterminate all of Zouken's worms. We would be doing this tomorrow. I was honestly surprised that Illya was going along with this, and when asked she told me it was because I gave her mother back to her.

[The next day] {3 days until Saber is summoned}

We spent the morning going over the plan again and setting things up. We waited until Sakura was on her way back from school when we initiated the attack on Zouken and kidnapped Sakura. Medusa was with Shinji, so she was unable to protect Sakura. As soon as I grabbed her, I used hypnosis to put her to sleep and reinforced my body as much as I could and began to sprint back to the manor. I didn't have Irisviel with me because servants can sense one another. We managed to get things done without a hitch. Berserked was going on an unopposed rampage to destroy the Matou's house and whoever is inside.

I got Sakura back and we immediately moved her onto the nearby table and began the procedure. I would be leaving most of it to Irisviel, but because we didn't know how much it would cost, there was plenty of food around for me to replenish my mana/prana/od with. It took about an hour, but we managed to remove all of the worms from her body, every single goddamn worm, we had to use her noble phantasm for her to even survive the one on her heart, and we weren't able to do anything about the black grail shards. Once it was over, I cried in happiness. I knew the pains of having those worms in you, I imagine that she had it worse than I. She had to endure dealing with the Matous much longer than I. According to Caster, she would be out for a while. I waited by her bedside until she woke up. Berserker had stopped his attack as soon as he finished completely squashing the Matou's house and as many worms as he could see. Which hopefully was a good number of them.

[A couple hours later]

My sister finally began to stir awake.

"I see you are awake now" I spoke. A smile on my face.

"?" (Need to study sakura dialogue: but basically "Who are you?")

I chuckled "I guess you wouldn't recognize me Nee-san, I look quite different from when we last saw each other. It doesn't help that our evil grandpa probably told you that I had died."

"T-Toma? Y-Your alive?" she stuttered, unbelieving, tears began to fall. I went over and hugged her. I rubbed her back.

"Sakura, do you want to hear some more good news?" I asked, she was barely holding herself together at the moment. I didn't wait for her answer.

"I got some help, but we were able to remove all of the worms from your body. You won't ever have to deal with them ever again." She started to cry even harder. I just stayed there, sitting on the bed she was on comforting my older sister, she ended up crying herself to sleep. I extracted myself from her arms and tucked her into the bed. I left the room and came across Caster and Illya outside. I bowed and thanked them from the bottom of my heart.

I was going to go out and take care of Shinji on my own. It took me a bit, but I eventually found Shinji, and Rider was with him. I created some black mud around them, and used it to create some warriors to distract Rider while I got rid of the Book of the False Attendant. It took a bit, but eventually I was able to get some mud on RIder and used it to drain her, I was not going to corrupt her. I used her weakened state to quickly destroy the Book of the False Attendant. Once that was done, I dispersed the black mud and approached them.

I told Rider that Sakura was safe and that as Shinji no longer had any control over her via the book. She understood what a piece of shit Shinji is and did not stop me from approaching Shinji.

I taunted him, admitted to being the one who set up the accident that caused him to lose his manhood, to setting him up to trip down stairs and to generally suffer at school. I revealed to him who I was. I used gradient air to make myself a simple dagger, and began to stab him. First on his calves, then his arms, followed by the sides of his torso. The stabs so far had all been along the edges of his limbs and torso. I had spent some time learning a weak ass fire spell and I was going to use it to cauterize his wounds. I then repeated the process, cutting him in different areas before cauterizing the wounds. I started to stab deeper into his torso, I avoided his upper body where his more valuable organs were. I continued to stab him a couple more times before letting him bleed out. Once he died, I left his body in the street and told Rider what had happened to Sakura and who I was to her. I then offered her to follow me back to our base of operations and she reunited with Sakura there.

I ended up asking Illya what her plan was for Shirou. She said that originally she wanted revenge, but her mom talked her down from that. She wanted to talk to Shirou for the most part. We continued to talk for a bit about everything and whatever came to mind.

[The next day] {2 days until Saber is summoned}

I finally got around to registering myself in with the administrator. I didn't have Irisviel tag along, as she would probably try to kill the guy… wasn't psycho priest also a master or something? I think he stole Lancer from somebody? Anyway, yeah, that happened. I got myself some lunch at a cafe before wandering around for a bit.

I wasn't sure how long we had until Saber was summoned, I mean, Archer wasn't even summoned yet. Huh, I wonder if Rin ever realized that I am her younger brother. Meh, thoughts for another time. I wonder how long it would be until I was given a sealing designation. I mean, I would probably end using my black mud at some point during this grail war, even more so if Sakura becomes Dark Sakura. Shinji's death was on the news.

I arrived back at the manor, and Sakura had woken up. I made my way to her room, and we began to talk about everything. She was surprised to find out that I was the reason that Shinji got injured so often and lost his manhood. I actually got a lecture from her about this. Sakura is way too kind to those assholes. Rider was there as well, we discussed for a bit about having her stay here for a bit and if she wanted to continue to go to school. I told her that Shinji's body was found this morning and that our adoptive evil grandpa's house had been totaled and smashed to pieces. She was upset.

She wanted to go back to school and not impose or be an issue to us. I had to explain that she wasn't at all. I managed to convince her to stick around for the night. Illya had asked Sakura about Shirou at dinner and was surprised that Shirou had a sister. They talked for a bit. I thanked Caster once more. She thanked me in turn for letting her be with Illya.

[The next day]

We went to school, separately of course. Taiga and Shirou were extremely happy that nothing had happened to her as Shinji had died and their house being smashed into pieces. She said that she had been staying over a friend's house for the night. They were happy. Shirou offered her a room to stay in at his place. We talked during lunch for a bit. I told her to go and live with her crush, just please confess to him already. She blushed for a bit, but she was overall thankful.

When I got back, Illya wanted to go and talk to Shirou today. I decided to tag along, and told them that Sakura was going to be staying there. We headed over there and knocked on the door. Irisviel was with us along with Berserker, but he was in spirit form. I stayed by Sakura and helped out in the kitchen while Shirou, Illya, and Irisviel talked. Both Einzbern women immediately took to Shirou (because I had told them about what their father/grandfather had done), with Illya adopting him as her sibling, and Irisviel adopting him as her son. Shirou was surprisingly accepting of the situation. Illya wanted to stay with Shirou for a bit and to get to know him, Irisviel wanted to dote on her adoptive son. I was there to watch the chaos with Sakura. I asked her if she confessed to him yet. She said no, and that she feels unworthy of her senpai, that she was tainted, broken. I talked to her for a while and tried to convince her that Shirou would not care about any of that at all, and if it would help, I would ask Shirou his thoughts on her. She blushed and told me not to. I am sorry Sakura, but I will get your senpai to notice you before you become crazy or something. We continued to talk for a while and catch up.

I waited until everyone else was asleep, and while servants didn't really need sleep, Caster was going to anyway with Illya. Rider stood guard over Sakura. Shirou went to his shed and I confronted him there. He was a bit defensive at first, but I asked him to sit down so that we could talk. I started to tell him about this life of mine, about how I was Sakura's twin and younger brother, how Zouken had tortured us, how shinji had been abusive, how I crippled Shinji, and what was happening right now. We talked for a bit, before I broached the topic of Sakura and his thoughts on her. He was dense and considered her his best friend. I merely sighed and began to explain that Sakura likes him. He was unsure of why anyone would like him. I had to explain that he was one of her few bright spots in her life, the safe haven that she could go to and pretend to be normal. That he was the person who made her feel happy. I explained just what he meant to Sakura.. I eventually managed to convince him to take Sakura out on a date or try to look at her in the romantic sense.

[The next day] {Shirou is probably not going to summon saber unless we make him, but that would be tomorrow}

So Shirou asked Sakura out on a date, I got a death glare from Sakura, who knew she had it in her for that. They would be going out on a date later. Before we left for school, I suggested having Shirou summon a servant as well. He was a solid maybe at the moment. There was school today, but after that, well I went out and scouted the city and enjoyed myself. Before heading back and going over some more simple magecraft.

The servants felt another servant being summoned, and I pushed for Shirou to summon one as well. I wonder if he would still summon Saber… which might get a bit awkward with Iris being my Servant.