School. You were friends with girls who were a grade above you. A new guy came to their parallel class - Arataki Itto. In appearance, he looked very scary, he was tall, large and had a rather difficult character. But.. sometimes he behaved like just a cheerful noisy child. Since he came to school, quite a few adventures have happened.

You had nothing in common with him at all, and you never spoke to each other, not even a few words. He did not know you, you did not know him. It would seem that you did not care about each other. And why should there be?

So, lately your friends have started to act suspiciously... When you were together, they smiled and looked at you sarcastically, whispered about something secretly from you, and also often said "are you sure that there is nothing like that on your phone?" So, today you got sick and did not go to school. You're lying in your room, just staring at your phone, when suddenly you get a message...

"Hi, how are you? Why didn't you come today?"

...These messages from the contact "Itto" appeared on the screen. You were confused. You didn't have his number...