Totski Kiko and Totski Niko were twins, partners in crime. They did everything together. They even had a crush on the same girl, (y/n) Tateyama. Who also happened to be friends with both brothers.

The Totski brothers would do anything for (y/n)~chan. ANYTHING. Even kill for her, they were willing to go over that line if it meant Tateyama~san would stay by their side.

During a basketball game, the Totski brothers watched (y/n) as she cheered with the rest of the cheerleading squad being as though she was the captain. She jumped around, cheered and did tricks in her outfit that the boys liked. (Y/n) waved to the brothers and continued motivating the team. The game was then over after a few more rounds, the captain of the basketball was flirting with (y/n). She just wanted to be just friends though, the captain then pushed her into an alleyway and began forcifully kiss on her neck and feel on her thighs.

"Stop it! Get off of me!"

Tateyama pushed the captain to get him off and he slapped her, the Totski brother happened to be walking past when they saw what was happening.

"Leave her alone" Kiko said pulled out throwing knives.

"Or we will have to use violence" Niko continued pulling out a gun.

"To protect our (y/n)~chan." The brothers said in unison.

"Get the hell out of here. She's none of your concern!" The captain shouted ripping her shirt slightly.

"Shall we deal with this nuisance, brother?" Niko said smiling.

"Of course brother." Kiko replied with the same sinister smile.

They both ran towards the captain, Niko shooting him in the shoulder and Kiko throwing a knife at his hand. The captain let go of (y/n), who slumped to the floor crying a little and stared in shock at the brothers. Both brothers then aimed at the captain's head, shooting and throwing a knife at the same time. The brothers laughed manically, watching the body slowly stop moving.

(Y/n) got up covering herself and looked at the body, it was her first time looking a dead body. She thought she would vomit, but in reality she enjoyed the sight of the lifeless body. She smiled devilishly and asked Kiko for a knife, he obediently gave her one. She then began 'decorating' the body, cutting into it. Shredding his skin, tearing at his insides. Stabbing his chest 100 times while crazily laughing, carving a heart into his forehead and taking out one of his eyes as a souvenir. She then flipped him onto his stomach and stomped on his head hard, cracking his teeth, breaking his neck and nose. As a finally touch, (y/n) cut out the captains tongue. Her torn clothes were now drenched in blood, some dripped down her chin and splattered

The twins didn't love (y/n) any less because of this act, no in fact they were head over heels in love with her now. She was truly their everything.

(Y/n) was now a true yandere.