"You know when I was younger,I dreamed of being a hero of justice"

She dreamed of being an 'ally of justice' yes, she knew that. It was an impossible dream yet if she could reach her hand out to grasp it;if there was a possibility.
The man only smiled leaving Illya confused in his words.

Illya's eyes snapped was in her room, in Fuyuki, Japan, Not in the Einzbern's castle. It felt so real,despite it had happened a few years ago. This day is her birthday, her eighteenth birthday or the day of the fifth Holy Grail war. She heaved a sigh. She won't be making it until her graduation, because her being the lesser grail and stuff. If her position as the lesser grail was enough to make this world a better place, she might as well succumb to her fate. Kiritsugu never told illya that,. It was Illya who persuaded her maids to tell her everything. "Illya!" a familiar voice called out to her. Taiga, Kiritsugu's best friend and now, her guardian came rushing in her room. "Why haven't you gotten dress yet it's nearly time for school" Illya let out a grin, "heh heh heh I just woke up, tiger"
"Who are you calling tiger?" Taiga shouted
After a cup of instant ramen, Illya left for school. It was a small place, comparing it with her old castle but it's more comfortable because of the more number of people. She said hello to Miyu,her fellow classmate and friend. It was a normal school day and Illya regretted thinking that later.
She walked down the streets in the night. It was probably around 8 pm now but she didn't care,she could protect herself anyways. Noticing the footsteps behind her she stopped to turn around but saw nothing. It was probably a cat or something, thought the girl. Its presence grew stronger and stronger and Illya began to shudder./p
"Are you afraid of dying?" A quiet yet, dangerous voice rang in her ears from behind. She quickly turned around for the second time and found a figure standing behind her. It was probably a male, from her homunculi senses. He wore the church's clothing and had a cross-shaped necklace. "Who are you and what are you doing around at night?" Illya asked "that's not important,I ask you are you afraid of dying ? " She simply grinned at the stranger and said "I don't know why you are asking this but I am not afraid of dying, I might die anytime soon. " and then she felt pain in her chest. It was a small, single blade. She recognized it immediately, the black keys of the church. Before she could react her consciousness gave up and she was swallowed by darkness once more.
"do you choose to be the Einzbern's puppet or come with me, a horrible father who betrayed your family,let your mother die and caged you into solitude." Illya pointed at him and he smiled like he always does even thou the lights in his eyes are long gone.
She gasped, brought back to reality by a loud noise. It was a little girl screaming at her sight. Her clothes ripped at where she was stabbed and blood smeared her whole body and on the ground. It must've been horrifying and more horrifying as she stood up and looked at herself. Wait…I'm alive? Illya gazed at her blood in confusion. The wound healed already,not leaving a scar behind. Illya walked back home, not aware of what to do next. The house was dark and quiet,Taiga already went back home. She drew herself a bird figure from thread. The one who attacked her was so fast she didn't had the chance to launch an attack. She gritted her teeth. It was a miracle she was still alive, to be a hero of justice, she had to handle things harder than this and she failed at the first step. As she was lost in thoughts, the same blade missed her by an inch of her hair. 'wait he's here again?' Illya screamed mentally. She ducked the second blade swung at her as the red-haired reached his hands in his pockets to grab some more. She released her white bird and he just sliced it apart as if it was pizza.

Illya started to panick. She had a second chance already, there was no way she was failing again. The intruder cornered her and she jumped out the glass window, glass shards slicing into her skin almost everywhere. She ignored it. Now she just have to keep the distance from him as much as possible, for her surprise attack to work. Illya kept running, past her koi pond and the miniature bridge. Then he jumped, landing in front of her. Illya released another bird but it was no luck. He swung the blade up to her throat and Illya dodged downwards and rolled past him. In the moonlight, it was much clearer to see his face now, his golden eyes reflected Illya's crimson ones. He seemed to be around her age, maybe even younger. She panted and scrambled into the shed, there might be something there to help style="mso-spacerun: yes;" /spanShe threw a random screw, no luck he dodged it perfectly. Illya scurried backwards until she hit the back of the wall, a hammer in hand. Suddenly, a white light erupted around the room. She blinked, a new figure was standing before her. The boy seemed to have disappeared. The newcomer opened her mouth. "Irisviel…?" Illya stared in shock, unable to move. She wasn't planning on joining the grail war and fate played with her.
The heroic spirit dashed through the door, trying to locate the boy that almost killed her master. He jumped down the rooftop and something caught him, together they disappeared in the dark night. She clenched her sword tight. "tch" The girl walked out of the shed, there were command seals on her right hand so she must certainly be her master. She turned to her master. "I am Illya emiya, formerly known as 'Illyasviel vons einzbern 'and I'm not Irisviel, she is my mother"
"I'm saber" Saber said that last name…of that man. She thought.

Waver velvet never thought he would get a chance. He stared fondly at the mark on his hand. Well, he regretted bragging about it thou… Coules forvedge yggdmillennia and Melvin weins insisted on coming along with him, The first claiming to go in his sister's stead and the other said that he was a kind person, which doesn't make sense Thank you very much. While he was deep in his thoughts they finally arrived at the outside, Coules took photos, maybe for his sister and Melvin enjoyed tacokiki takoyaki or something. Waver was annoyed, his friends were making this trip slower much to his annoyance. "We should get going "Caules looked at his watch. "Finally" Waver groaned It was nighttime in Fuyuki now. Melvin lead them to a big building in front of the park. The room was small and consists only two beds. "I'll sleep on the floor" Caules said after he placed his bag on the shelf. "Wait what?" Melvin half-screamed "You heard what I said" Waver placed the chickens down with a knife in hand. A single chop and a blood spill made the other two quiet. "What was th—" Melvin coughed fits of blood on the floor, Coules narrowly dodging it. "For the circle" Waver replied
"Aren't you getting too worked up, it's still two weeks away" Caules checked the beheaded chickens "The sooner I summon the servant, the better"
"Why do you want the grail so badly anyways?" Melvin asked
The one being asked didn't reply, or he couldn't.

Issei stared in horror,it was never leaving his hand no matter what he tried to do. First,he tried rubbing it off then,he tried rinsing it with water after that he tried rinsing it with other chemicals. He has no idea what it is but he only knows it's not going to come out easily. Souichirou Suzuki walked past his room, Issei greeted him like usual. He respected him greatly,in his skills. "What's wrong with your right hand?" The spectacled man asked "Nothing" The eyes behind the lenses flared looking at Issei. He had an instinct that Souichirou might know something about the mark. Before he knew it,his wrist was pulled forward, revealing the marks on his hand. The man's eyes widened "This is…"

Shinji looked at the book in his hand, given to it by his sister. He recalled the recent memory.
"You're just fighting in my place, wouldn't that be fun? You're a master now" The purple haired grinned "or if you wish to—"
"okay, okay I'll do it"
Shinji never knew why he said yes to that. He must be insane. Of course,he's afraid of dying, anyone is afraid of dying. His mind drifted through the time his grandpa sent him to that room, only a thought of it made him want to puke.

Rin checked for the hundredth time that she had everything. The circle was set up,enough lights enough space and enough mana.
She chanted the words as the light engulfed the room and sent her bursting out. She looked up, a tall figure spoke. "Hey, your room looks messy"

The servant ate his last piece of salmon. His master was standing in front of a window. "The moon today is beautiful isn't it?" He asked his master "Yeah, surely it looks more circular wait—sorry I don't understand what you are saying" The warior's eyes set on his master. He looks peaceful,staring at the moon. "Why do you like staring at the moon, master?"
"It was the only thing that shined no matter how tall the fire grew" The servant blinked "You really are an interesting person Shirou kotomine"

A/N
I've hoped you've noticed by now about some changes yep, the protag is Illya and Waver and Melvin were 19 during F/SN also,I tried to half-reversed sakura and shinji. It's not detailed but I'll try to do better next time. Sorry it was so short.

Ps. Caules is from fate/apocrypha if you don't know :p

Edit: I edit it so it should be a little easier to read