S3·E8 Who is Ryo? The college girl thrills at detective work

Ryo comes across a college girl who is a fan of detective movies, and tails Ryo for a chance to see some action, not knowing Ryo's lecherous tendencies. However, it turns out the college girl has been targeted for unwittingly witnessing a crime and Ryo must intervene after Kaori has been kidnapped by these same criminals.