Mikan lives alone with her older brother. Her brother, who had never once mentioned having a girlfriend, suddenly gets married—and his new wife, Honoka, moves into their home. Before long, Mikan discovers a secret shared by her brother and Honoka, a revelation that pulls her deep into the world of lesbian romance. As it turns out, Honoka’s true target all along was Mikan. With her brother away and no way to escape, what will become of Mikan...?