Rin is in the middle of exorcism class in the cram school. The current class is Anti-Demon Pharmacology, which is taught by none other than his own twin brother, Yukio.

But Rin isn't paying attention. He finds the class boring and he can't concentrate— he'd rather go out for some real combat! Some hands-on practice. Instead he's got to hear about random herbs and stuff...

Rin looks out of the window with a quiet sigh, his head on the table.