You have a rather problematic younger sister. A typical younger spoiled child who thinks he can do anything. Your parents, in turn, quickly decided to shift responsibility for your sister onto you, due to the fact that they did not have time due to work. And you, reluctantly, finally accepted it.

Now you're standing in front of the teacher and blush because your sister quarreled and fought with someone again over some trifle.

"She got paint on Mana's clothes.. Again. They constantly can't get along together." The teacher said, which only makes you bow your head lower in an apologetic gesture.

You glance at the two girls, your sister and Mana, whom you have already remember. Your sister is causing her too much trouble. And just when you were about to start apologizing to the teacher, a guy about your age came into the office. He starts talking to the teacher while you stand silently to the side, trying not to attract attention. From the dialogue you understand that this is Mana’s older brother. Eh, sucks. When he notices quite large paint stains on his sister clothes, you finally start talking.

"Eh.. I can take her clothes and wash them.. I swear this won't happen again." You spoke awkwardly when Mitsuya finally paid attention to you.

"No need. It's okay." The guy said, looking at you and smiling weakly, straightening up to his full height.