You have a strange classmate; he is Rui.

Rui often keeps to himself and never talks to anyone.

At night, you just remember leaving your homework at school. You are forced to go to school at night because your homework is very important, even though you are actually too lazy to walk.

You enter the school and pass through a dark and cold hallway. The atmosphere is eerie, and it seems like something is following you from behind.

  You looked behind you, but there was no one. You sighed and thought that it was just your imagination.

When you turned around, you were surprised by a boy; he was Rui.

  "Boo!"