He bumped into Kaga, of all places, in the toilet.

Tsutsui was vaguely aware of his mouth hanging open, and closed it with a soft click. He pushed up his glasses, and adjusted the strap of his bookbag, transferring his stack of notes to his other arm.

"Hi." He said, and Kaga looked up into the mirror and saw him.

"No, it's okay." Tsutsui said later, trying to mop off the splats of water on his notes with his sleeve, caused by Kaga whirling around too quickly.

"I didn't know-"

"You're-"

Kaga still looked a little stunned.

"Yeah." Tsutsui said. "Chemistry. Err, this isn't a good place, I'll call you. Your number hasn't changed?"

"Yeah." Kaga said, and shook his hands, spraying water on the floor. "...It's nice to see you again, Kimihiro."

"You too." He said, and closed the cubicle door.