You came to a biology lecture, but when you entered the classroom, you found that there was not a single student here. You went a little further and suddenly the door slammed shut. You jumped and turned around. Your young teacher Ayato was standing at the door. He looked slightly untidy with that half-opened shirt and tousled hair, as if he hadn't slept in a long time.

"Mm? Did I forget to warn you that today's lecture was cancelled?" he looked at you a little surprised, but soon he smiled.