Midoriya Inko couldn't have been any happier.

Yes, her bastard husband abandoned her, but he gave Inko her sunshine, Midoriya Izuku. Her son. There's nothing in the world she wouldn't do to make him happy.

That's why it really concerns her when her son brought home a creature from a legend long time ago.

As her mother once said: 'Force the world to revolve around you. It's more fun to think that way'

Granted, her mother was an entitled woman, but she was a great person. Her crazy ass quotes made Inko the kind woman she is today. But she, and her kindness, has her own limit.

No one could even match her rage right now. Not even Mitsuki. Sure, she got angry before. She got angry back in 4th grade, where someone bullied her friend. She got angry when the police declared her dad as 'death' when they haven't even attempted to search for him when he went missing. She got angry when her husband was in another country, knowing damn well that she was 1 week into labor. She got angry when some doctor crushed Izuku's dream when he was diagnosed Quirkless. She got angry at herself when she couldn't support her son's dream. But nothing matches the angry she was feeling as she stared at the messages on her phone.

Her son-of-a-bitch husband wanted a divorce, because her baby was Quirkless.

The anger in her suppressed any slight tinge of sadness she felt. The hell fire that burnt in her eyes would make Endeavor's fire looks like one from a candle. That motherfucker, instead of caring about his son, decided to abandon Izuku for something that's not even his fault!? Well, fuck him! Inko would gladly sign that divorce paper if it means that asshole never got near Izuku ever again.

But that would mean Izuku will have to grow up without a father figure in his life.

Her baby already has it bad. His dream of becoming a hero is ruined. No other kids want to play with him. And now, his father has abandoned him.

'All just because he was Quirkless!' She gritted her teeth at the obvious discrimination her son faces.

Regardless, they're better off without Hisashi. It's better to have no Father than one that doesn't love him. Besides, the alimony could give Izuku a better life. A life he deserves. If there's no one, Inko will always be there for her son.

But, inside, she prayed to whatever deity out there that her son could have someone else he can rely on.

Little that she knows, her wish would soon become true.

For better or for worse, though?

5 years after his 'father' had 'left for overseas business' (Izuku was anything but stupid), Izuku, now 10 years old, was having a life that he would call 'suck as fuck'. Because he was Quirkless, no one wants to be his friend. Most people either try their best to interact with him as little as possible or outright just ignored him, and that's the better part. The rest found joy in pushing him down further than where he's already at. One most worth noting, is Bakugou Katsumi. His childhood friend, his first friend (his Kacchan), and now, his bully.

Like usual, after she had beaten him black and blue along with her lackeys, she left Izuku alone with his injuries, not forgetting to throw insult and show him expressions that he still couldn't place.

"At least she didn't hit me in the face or anywhere noticeabl- Ouch!" Groaned Izuku as he tended to his injuries.

Sitting among the trash at Dagoba Beach, Izuku's favorite personal spot, he applied some liquid on the burnt marks and the bruises that Katsumi left him. Just like usual, he supposed.

After he has done with the injuries, Izuku took out his notebook and jotted down the Heroes and Quirks he saw today on the news. Quirk analysis is his own way of relaxing. Plus, he's good at it. Too good that his mother used to believe that Analysis was his Quirk. But, another trip to a Quirk doctor ruined any hope he had left as they reassured them that Izuku has no Quirk.

Like every time, Izuku finished his analysis just as the sun has finished its job for the day. Packing up his notebook, Izuku headed home.

Until something caught his eyes.

As he was walking, Izuku noticed among the trash, there was a book. At first glance, it has a look of an old book but as Izuku picked it up, he could tell that this was a well-preserved one. The front has no scratches, its empty cover without a title gave out a mysterious aura. Curious, Izuku opened the book. The pages were kept in perfect conditions, but its age was visible as there were yellow stains on the surfaces. Izuku flipped through the pages as he realized that just like his notebooks, this was an analysis book, or something similar.

Each pages contains a picture of creatures Izuku couldn't name. But he knew that these aren't animals that everyone can find in the zoo, considering that the first page that he flipped through already talks about FREAKING DRAGON!? Izuku stuffed his face into the book, figuratively and literally.

SPECIES: DRAGON

SIZE: 13' - 50'

DESCRIPTION: CRUEL, CUNNING AND VIOLENCE. WILL CRUSH AND DESTROY ANYTHING THAT STOOD IN THEIR PATH. DESPITE THEIR INSIDIOUS NATURE, THESE CREATURE LIVE BY A CODE THAT THEY RESPECT. LOYALTY TO PEOPLE THEY SEE AS SUPERIOR TO THEM, ALTHOUGH UP UNTIL THIS IS WRITTEN, THERE ARE NONE. THEY DISLIKE HUMAN, THUS EXPLAINS THE RARE TO NONE-EXISTANCE SIGHTINGS

POWER/ABILITIES: ELEMENTAL BREATHING, FLYING (MOST OF THEM), EXTREME INTELLIGENCE, PIERCING SCREAM, HUMONGOUS SIZE

HABITAT: UNKNOWN (I HAVE REASONS TO BELIEVE THAT THEY LIVE AMONG US, BUT NOTHING IS CONFIRM)

TIPS: IF YOU SEE ONE, JUST PRAY TO WHATEVER GOD THAT THEY DON'T SEE YOU

DANGEROUS LEVEL: DON'T EVEN TRY

CAPTURE POSSIBILITY: 3%

What the hell!? Doesn't this mean dragon exist? This is either an elaborated prank, or that this world is more than it seems.

Either way, Izuku stuffed the book into his backpack and headed home, unaware of the figure stood from far away watching him left.

After a dinner where Izuku dodged most of the question Inko asked him about school, he quickly took a shower before going inside his room and continue with the book.

Hours of reading through, Izuku learned more and more about creatures that may exist in this world but no one knows about.

SPECIES: TROLL

SIZE: 7' - 10'

DESCRIPTION: HUMANOID CREATURE THAT LIVES WITHIN THEIR OWN TERRITORY AND SOCIETY, AWAY FROM HUMAN. FEW ARE DESCRIBED AS DANGEROUS TO HUMAN BEING, BUT MOST OF THEM ARE FRIENDLY. KIND AND CARING. HOWEVER, DON'T ANGER AS YOU WOULDN'T WANT TO KNOW WHAT COMES NEXT

POWERS/ABILITIES: STRONGER THAN NORMAL HUMAN BEING, PERFECT TEAMWORK WITH ONE ANOTHER

HABITAT: VARIES. MOSTLY COMMON IN THE WOODS, BUT ALSO SPOTTED AT SWAMPS, MOUNTAINS, WATERFALL. AWAY FROM HUMAN BEING

TIPS: BE NICE TO THEM AND THEY WILL BE NICE TO YOU

DANGEROUS LEVEL: MEDIUM. WON'T ATTACK ON SIGHT BUT WILL IF TEMPTED

CAPTURE POSSIBILITY: 60%

SPECIES: FENRIR

SIZE: 6'

DESCRIPTION: A GIANT WOLF IN NORSE MYTHOLOGY. THEY'RE LIKE CERBERUS WITH ONE HEAD. DANGEROUS BUT LOYAL. JUST LIKE A HUGE DOG. ALSO CURIOUS

POWER/ABILITIES: AS FAST AS THE WIND, JAWS AND TEETHS THAT CAN SHRED ANY ARMOR

HABITAT: IN THE WOOD AND CAVE

TIPS: CURIOUS, SO THEY WILL INSPECT YOU BEFORE THEY DECIDE WHETHER TO ATTACK OR NOT. TRY TO ACT CALM AND FIERCE, BUT NOT DANGEROUS. IF YOU SUCCEED, THEY WILL SEE YOU AS THEIR MASTER

DANGEROUS LEVEL: MILDLY DANGEROUS, BUT IF THEY DECIDE TO ATTACK YOU, YOU ARE ABSOLUTELY FUCKED

CAPTURE POSSIBILITY: 80%

The more Izuku read, the more he is enthralled to it. Things only got more interesting when Izuku found a note between the pages with the title: "SUMMON GUIDE"

Izuku pulled out the paper and started reading it.

SUMMON GUIDE

SUMMON YOUR FIRST MONSTER! TOTALLY NOT RECOMMENDED DUE TO HIGH RISK OF DEATH. BUT, IF THAT DOESN'T STOP YOU, FOLLOW THIS GUIDE CAREFULLY AND THOROUGHLY TO INCREASE YOUR ALREADY SLIM SURVIVAL CHANCES!

PERFORM THE RITUAL DURING SUNSET FOR BETTER CHANCES OF SUCCEEDING

DO THIS ALONE

READ THE COMPENDIUM FIRST TO EASILY IDENTIFY THE MONSTER THAT YOU HAVE SUMMONED AND HOW TO CAPTURE IT

WRITE YOUR LAST WORDS AND WILL FIRST BEFORE ATTEMPT THIS. DON'T WANT TO DIE A QUIET DEATH, DO YOU?

DRAW A CIRCLE INSIDE A SQUARE ON THE GROUND. INSIDE THE CIRCLE, DRAW A STAR THAT FITS THE CIRCLE JUST RIGHT

SLIGHTLY CUT YOUR HAND FOR LITTLE DROPS OF BLOOD AND SPILL IT IN THE MIDDLE OF THE STAR

CLOSE YOUR EYES

CHANT THESE WORDS: UHMELAH JUSA KALU SHUPA HAULI KASA

CONTINUE CHANTING DESPITE WHATEVER IS HAPPENING AROUND YOU

DO NOT, FOR ANY REASON, OPEN YOUR EYES. EVEN IF IT IS SOMEONE YOU KNOW TELLING YOU TO BECAUSE IT IS NOT

ONLY STOP CHANTING WHEN YOU HEAR A STRANGE VOICE SAY YOUR NAME

ATTEMPT TO CAPTURE YOUR MONSTER

THERE IT IS! THE COMPLETE AND ONLY GUIDE TO CAPTURE A MONSTER! HOPE YOU WON'T DIE DOING THIS! ALL THE BEST!

Izuku stared at the note for a good while before the only thought came into his mind.

He needs to try this!

After powering through the usual bullshits happened to him with the sole purpose to attempt the summon, Izuku finally made it through the last period before he dashed out of class to go back home, earning a (worry) weird look from Katsumi.

Throwing the bag in his room, Izuku grabbed his jacket, a pocket knife and the compendium before he left the house, not forgetting to leave a note for his mother saying he'll be late and where he'll be. You know, in case something happened.

He arrived at Dagobah Beach 15 minutes before sunset. Upon arrival, Izuku quickly looked around for a stick to draw on the sand. Luckily, people thew a lot of stuff here. Picked up the baton he found, Izuku moved to an empty area, looked around for any sign of human. After confirming that there were none, Izuku proceeded to draw what the note told him to. Years of drawing allowed Izuku to perfectly replicate what the note told him to draw on first try. Izuku hastily read through the note, reminding himself not to miss out any important details.

10 minutes felt like hours to him. When finally saw the sunset, Izuku slid the notes into the book and walked towards the middle of the ring, the pocket knife in his hand. Bracing himself one final time, Izuku put the knife in his hand, grit his teeth and made the slash.

His eyes twitched from the pain as he felt the sting of cut and the wetness of blood dripping from his hand to the ring. Took in a deep breath, Izuku closed his eyes and chanted.

"UHMELAH JUSA KALU SHUPA HAULI KASA."

Although closing his eyes, Izuku could felt the ring started to shine. Human curious nature tempted him to open his eyes, but Izuku squinted his eyes shut and continued chanting.

"UHMELAH JUSA KALU SHUPA HAULI KASA."

This time, he heard a voice. A strange yet familiar voice.

"Young man, stop whatever you're doing and open your eyes." A deep voice he recognized as All Might, said to him.

'OHMYGODALLMIGHTISHEREHISIDOLISHEREANDTALKINGTOHIMHENEEDSTOOPENHISEYE-' Izuku's silent mumbling inside his head stopped as he remembered the note.

DO NOT, FOR ANY REASON, OPEN YOUR EYES. EVEN IF IT IS SOMEONE YOU KNOW TELLING YOU TO BECAUSE IT IS NOT

The warning echoed inside his mind stopped Izuku from doing something he regretted. Izuku continued chanting.

"UHMELAH JUSA KALU SHUPA HAULI KASA."

Another voice called out to him. This time, a ghost from the past that he thought he had already forgotten about.

"You useless child! Open your eyes right this instant!" The voice of Hisashi commanded him, which Izuku easily ignored and continued chanting.

"UHMELAH JUSA KALU SHUPA HAULI KASA."

This time, a very familiar voice came whispering into his ears.

"Deku, please... open your eyes!" Bakugou Katsumi pleaded him.

This made Izuku stopped for a quick second before he bit his lips and shouted.

"UHMELAH JUSA KALU SHUPA HAULI KASA!"

All of a sudden, it seems like everything stopped. The blinding light he felt became dimmer and dimmer. Katsumi's(?) voice stopped whispering inside his ears, leaving only a dead, ominous silence. Izuku felt his breath became heavier and heavier as the seconds flew by, afraid that he had botched the ritual. Until a voice called out to him.

"Midoriya Izuku, it's done."

Still fearing that the ritual was tricking him, Izuku's eyes remained shut.

"You did well, child. Open your eyes, Midoriya Izuku, and witness the creature you have summoned."

The 11th rule came into Izuku's mind as he slowly opened his eyes. In front of him, was an old man in a black sorcerer-like robe. The hood covered his face, but Izuku could felt his age through his tone. Plus, the white beard gave out a lot of info.

"Are you..."

The man tiredly chuckled. "No, child. I'm not what you have summoned. I am but a spirit of a man who had written that compendium you adopted yesterday."

"o-Oh, I-I didn't know. I-I'll return it to you immediately, sir!"

"Fret not, child. I have no use of it. Not anymore." The man assured. "You are now that compendium master. Use it wisely."

Izuku slowly nodded his head in shock. The man saw that as a sign to continue.

"I'm here to inform you that the ritual has succeeded. Usually, I would guide you through the process of capturing your first monster. However,..."

"D-Did I do something wrong?" Izuku timidly asked.

"No, child. It just... the creature you summoned, is beyond my understanding."

"B-Beyond your understanding?"

"I spent my life researching mythical creature that no one believes exist. Even in death, I assist my pupil's research. And yet, never have I seen a creature like this one." His eyes shifted to Izuku's leg.

The green-haired boy followed the man's curious look with his own and found a creature stuck to his leg.

It has an octopus-shaped head with sharp, brighten yellow eyes with no pupil stared at the ocean. It has a green body with small green wings on its back with hands and tentacles wrapped around Izuku's leg.

"Th-This is the mythical creature I summoned?"

"Apparently. And it already looks quite attached to you. I must say, this is quite an extraordinary case!" The man exclaimed, before he quickly shifted back to his serious manner. "Although, we only learnt about 5% of the ocean. Even with mythical creatures discovered, it is only a total of 20%. There are many things about the world not even us are aware of. Like this... Quirk, for example."

"Qui-Quirks are weird?"

"Maybe not to you, child. But when I was still alive, one possession of ability usually results of one being shunned for it. After all, us humans are afraid of things we don't understand." The man explained. "That is why we exist. We research what people think as mythical. We study what others think are legends. You, Midoriya Izuku, are our successor!"

"S-Successor? I don't know if I'm worthy enough..."

"I beg to differ, child! Not only have you survived the ritual, you summoned an unknown monster. That already qualifies you as a fellow researcher." He said. "That compendium is now yours. The only thing that could hinder your research, is your will and your imagination. Welcome and good luck, Researcher Midoriya."

With that declaration, the old man disappeared, leaving Izuku and the monster he summoned.

"N-Nice to meet you! My name is Midoriya Izuku! M-May I know your name? W-Wait, can you talk?"

"Cthull."

"Cthull?"

"Cthull!"

"So, your name is Cthull? That's a cool name!"

A/N: I was writing Shinobi Hero when this thing called idea kept fucking with me in the head and came this fic as a result.

Still deciding on the pairings for this fic because you know, it's Izuku. He could literally be paired with anyone. I've always wanted to write a fem Katsuki though, so that's this fic first pair, I guess.

Now I have to juggle between this and Shinobi Hero. God...