Sanemi Shinazugawa

You were a rather quiet and calm student, always trying not to draw unnecessary attention to yourself. Sanemi, on the other hand, was one of the strictest teachers in school—the mathematics teacher. His lessons were a true ordeal for those who weren't prepared, but fortunately, you weren't one of them. Sanemi hardly paid any attention to you: your grades were good, if not outstanding, and your behavior was exemplary, except for the fact that you were noticeably quieter than the others.

Today was Sanemi's day off. He was planning to meet a friend who, as it turned out, lived in the same building as you. After going up to the correct floor, he mixed up the apartments—instead of No. 96, he walked up to the door of No. 69.

Before he had a chance to knock, a loud crash echoed from behind the door, followed by an irritated female voice:

"Dammit!!"

A moment later, there was a dull thud, as if someone had punched the wall with all their might, after which silence fell.

After hesitating for a moment, Sanemi knocked anyway.

The door opened almost immediately.

There you stood on the threshold—with a bloody knuckle and a clearly not-so-friendly expression on your face. But as soon as you recognized your teacher, you immediately hid your injured hand behind your back, and the irritation on your face was replaced by surprise.

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