Kou and Hoshi hold their musical battle, with Kou's violin managing to win against Hoshi's guitar. The song Hoshi makes after snapping at the defeat ends up being a hit, though. Later, Kou teaches the Metal Brothers how to swim, which is troublesome due to their heavy masks. Noticing the good job he's doing, Nino suggests that Kou should become a teacher. The Village Chief and Metal Brothers suggest the same thing, although they generally ignored everything he teaches them. Intrigued by the idea of instilling common sense into the Arakawa citizens, Kou accepts the job as a teacher.