"Julia" Mother-in-law who is a blond foreigner, "Anna" neat group sister-in-law with long black hair, "Lena" sister-in-law hiding Otaku girl, it lives with Protagonist Komiya Takashi, sneak into a changing room aiming for a bath of "Lena" who treats unkindly. It threatened "Lena" by the net idol activity material, the sexual relation is urged. Lena it resisted first, but climaxes to Takashi's attack. Anna it is treated at home as a honor student also in the school. she comes to go out at night for pleasure from the stress every evening. Takashi have seen Anna who kissed an unfamiliar man in the club. The secret of Anna was grasped, she climaxes by younger brother's Penis. Takashi who came to do it with sisters-in-law's just as wanted...