Shirai is a math teacher with a problem... a handsome young problem, named Akagi. Akagi is an actor, but he's still in school, and can't always make it on time to class. As a result, Shirai has to give him individual instruction to ensure that his studies don't suffer. The problem is, Akagi is in love with Shirai, and won't give him a moment of peace. (Source: M-U)