Bouzu Kawai ya Kesa Made Itoshi

Daimaru, the son of a Buddhist priest, meets Miroku, also son of a Buddhist priest, at a doujou for a 10-day stay to start his priesthood. They promise each other to shave their heads together when they take over their temples.
Ten years later, Daimaru, who has become assistant to the chief priest of their temple, visits a beauty salon to get his head shaved. But there he is shocked to meet Miroku again who has become a hair stylist.