To some trendy socialite such as Yuzu, this awkward event is merely one more chance to make new friends, fall in love, and eventually encounter a kiss. Regrettably, Yuzu’s fantasies and style don’t conform with her brand new ultrastrict, all-girls college, full of obedient shut-ins and overachieving grade-skippers. Her showy look manages to catch the eye of Mei Aihara, the stunning and imposing student council president, who promptly proceeds to sensually caress Yuzu’s body in a bid to confiscate her phone.Thoroughly drained out of her very first day, Yuzu arrives home and finds a shocking fact –Mei is really her fresh step-sister! Although Yuzu initially attempts to become friendly with her, Mei’s cold shoulder pattern forces Yuzu to start teasing her. However, before Yuzu can complete her sentence, Mei compels her into the floor and yells her, along with Yuzu desperately attempting to break loose. After done, Mei storms from the area, leaving Yuzu to contemplate the real nature of her very first kiss, and the secrets behind the expression in the opinion of her brand new sister.