Description : Mayu's sister and Kenji's older brother go to the same school. The two had a physical relationship with no one. However, my sister was a so-called 'Tsundere' who behaved against her brother outside. One day, Kenji can rumor that Mayu has a boyfriend of the same class. Kenji could not be suppressed by jealousy, took the eyebrows and had sex out in unequaled everywhere in the school ....