(HE PUT GRAFFITI SOMEWHERE. SOMETIME. Yankumi is almost positive of it!

HAHAHA YES. And Kida hits on her routinely, and Yankumi routinely flattens him to the ground and they all get very friendly. Mikado notices Shin looking at him once or twice during these interactions, but is never quite sure whether this means that he actually knows everything, or whether he's just vaguely disapproving of his hair.

THEY WOULD HAVE. And then Yankumi would probably have adopted him and tried to reform him. HE'S HER STUDENT, DAMMIT.)