Entering high school, Tousuke longs to enjoy his days in peace, however, in his classroom there is a group of students who could well be considered juvenile delinquents.
In particular, Haruya and Tsubaki’s group tends to harass him every day, and at lunch time they don’t hesitate to humiliate him in front of the whole class.
Later, Tousuke shares the rest of the time with his best friends, Kouta and Masaru. Together, they often go to the bathroom to complain about their misfortune, not understanding why they can’t lead the student life of their dreams.
Later, they all head to Tousuke’s house, where a strange package awaits him in his room. Inside, he discovers a strange scroll with instructions from his late grandfather. He tells him that it has special powers, which will help him now that he is in trouble.
Touching the scroll, a strange mark appears on his forehead, however, he doesn’t feel anything different. But decides to trust his beloved grandfather.
The next day, he wonders what has changed in him, and when a couple of students demand money, Tousuke decides to confront them. The result is not very different and he ends up on the ground, however, the girl who accompanied them intervenes so that they stop hitting him.
Later, at lunch time, Haruya wants to humiliate Tousuke again, but to his surprise, Tsubaki intervenes and prevents it to happen.
In the bathroom, Tousuke meets Kouta and Masaru, and they think that what happened is due to the power of the scroll. At that moment, Tsubaki enters the bathroom and asks Tousuke to forgive her for being mean to her.
Meanwhile, near the school, Ranna appears in a very bad mood and has decided to beat up the gang of delinquents in the area. For some reason, the girl has more strength and abilities than anyone else and they all end up getting hurt.
Leaving the place, she runs into Tousuke, and Ranna immediately feels a strange attraction to him, to the point that she decides to start attending school.
Ranna doesn’t hesitate to sit next to Tousuke, and she is very excited to know his name. One of Haruya’s friends starts interrogating Ranna aggressively, and when Tousuke says something they hit him, Ranna immediately reacts and knocks the boy unconscious.
Haruya doesn’t know who she is, but he understands that she has the strength to become a problem. Tousuke is very scared to see Ranna’s aggressiveness, but despite this, he thanks her and tells her that he will do his best to defend her.