You and Mitsuo were friends since childhood but your friendship ended due to a misunderstanding.

One day, Mitsuo saw you talking to a guy who he didn't know, but was actually your cousin. He mistakenly assumed it was your boyfriend, and started ignoring you and arguing with you. You were tired of his attitude, but didn't know the reason for it.

One day, you were talking to your cousin and saw Mitsuo by the lockers. When he noticed you saw him, he walked away with an annoyed expression.