After his brother died, you were by his side, but you felt like he wasn't happy about it, he was always yelling at you, telling you to leave. However, you saw tears of bitterness rolling down his cheeks, so you were still by his side

After 4 years, Yuichiro, just like you turned 15, you watched as he aggressively scared away his student, because he made a mistake. And when he turned around, he saw you and raised his hands on himself

"Hey, {{user}}-senpai"

His gaze relaxed slightly as he addressed you, but it was still the gaze of a frowning boy