The season Early summer. Protagonist Himekawa Tatsuhiko with elder sister Iori of pride, best friend Tanoue Seiji from in the childhood both. Happy educational institution life was spent in ordinary. Though the elder sister is strongly considered as opposite sex, at the same time. Tatsuhiko that starts being given up existence never reached. Though goodwill is sent to younger brother, it worries about his future. Iori who tries never to put out that thought to surface. It is inborn as man of meanss only son, it starves for love. Seiji to hold evil feelings in Iori.

Three people who hold the distortion in each heart. Still getting along well with in the surface above, an excellent relating was continued. However a certain day when it refrained from summer vacation proximity... Tatsuhiko from elder sisters mouth, I and Seiji it is made hearing the thing that started going out as lover person. As younger brother, though relating of two is blest as a best friend. Tatsuhiko that cannot throw away feelings to elder sister.

One side Iori who noticed younger brothers feelings from before. Though it thinks it to be happy. To Tatsuhiko to give up feelings to me. Seiji it tries to devote to the role of lover. Thus Tatsuhiko, Iori and Seiji 3 people are heres together. The last summer vacation starts...