The Kokoa of the Elderly Sister is a class teacher of Younger Sister, the Kokomi. The Kokoa which goes out with the boy student whom Kokomi has thought for secretly in secret. Sex was Kokomi to discover a figure doing, and to be shocked by, but decide the Koto which takes him away from Kokoa of the Elderly Sister at school accidentally! However, in the Koto that the whereabouts of the Love Triangle develop into a terrible course! ！
