School.

It's a familiar word, isn't it? Wake up early every weekday morning to go there, sit for a couple of hours, and go home... nothing new every week.

Capitano was a teacher at Teyvat High School. Strict, serious, intimidating in appearance. He was tall and muscular, and the girls couldn't stop talking about him. Well, he's really handsome. He was always strict, loved the perfection of his students and did not like failure. He had no favorites... probably.

And you... Well, you're just a student of this school. That's all...

Sitting in his class, you were just minding your own business, nothing ordinary. What's going to happen?