Shougetsu, an honors student at the top of his grade, discovers the wonders of developing his backside. One day, a student from the same grade, Kyoujima, sees him anal masturbating in a classroom after school...

Centers on Kamo and his partner Tora, who work in the underworld as "avengers for hire," taking on jobs from the victims of violent crimes and families seeking vengeance for wrongs done to them. [ANN]