(Author note: this chapter is telling a bit of backstory about Kurumi and Minya)
Shinya Kurumi(19 years old), a highschool student that is feared by many around him, however mostly due to rumors that have spread overtime that differ significantly from the truth. The rumors are actually a precautionary measure, one that he himself arranged to be taken. Because the truth is something he believes would make life even more troublesome if it got out despite some of his old friends assuring him that it might not be the case.
Lets start from the very beginning. Kurumi was about 1 and a half years old when his parents and his older sister died in a car accident, he was in the vehicle too at the time. Kurumi was the only one who survived and his uncle, his father's brother took him in and adopted him. Kurumi's parents tried to avoid as much contact with his uncle because they didn't want anything to do with the family business and wanted to live a normal life for both them and their children's sake. Kurumi's now adoptive father's name is Shinya Haruko, he is the 4th successor/boss of a large criminal organization/mafia called 'The Dark Shine'. Despite how the name sounds it is not a cult or anything related to religious things like that.
Haruko, having lost his brother and having no children of his own for various reasons, decides that despite his late brother's wishes he will make Kurumi into the heir to be the next boss of The Dark Shine. Thus, he raised Kurumi as if he was his own son.
HOWEVER, when Kurumi was just 12 years old, he ERADICATED the entire Dark Shine mafia. His words to his adoptive father just before he killed him were "Your ways are too filthy and unworthy of the name 'Dark Shine' which I once admired and respected greatly. I was a fool for doing so in the first place, you're all just SCUM. However, I wonder what that makes me, especially after killing so many people."
Kurumi killed everyone that he didn't know very personally and trusted, he had made friends with a few people he met due to the mafia's connections. one of which would turn out to be Ryuto one of his very best friends and the very person that got all the people together to make it possible to take down the entire mafia in one night.
Kurumi supported himself from then on with the assets he had acquired from the mafia. He was roommates with Ryuto for a while and took on odd jobs and dealt with shady stuff but never did anything against anyone who was innocent or a good person, only taking on jobs that went against scum and the likes. After quite a while, about when he was 16 years old, Kurumi went off the grid, but only within the underworld. He realized that he was starting to change in a bad way, he was starting to ENJOY doing dirty deeds and killing people. He was SCARED of what he might become, afraid that he would turn into something as bad as the other lowlifes or even worse.
Thus, he decided to suddenly try to live a life without doing the dirty deeds and try to go through like a normal person. Well, as normal as he thought he had the right to anyway. He acted like a delinquent for a while in middle school and then decided to spread rumors about himself to make people fear him so he wouldn't be involved with anyone too much. This became a well-known rumor but only for those who actually know him or go to school with him, and then eventually it all led to where he is now.
Takumi Minya(18 years old), a highschool student who appears normal but hides a dark secret, she is a killer. When she was 8 years old her family was killed by the Dark Shine mafia due to various reason the biggest one being debts. She was the only one who they let go/survive and she became an orphan. She was taken in by a thug who taught her how to live on the street and survive and saved up money to send her to school and whatnot. She eventually developed some sort of second personality and began to kill people to satisfy her twisted desires and blood lust.