Natural airhead Chiho Sakuranaga entered an all-girl's high school due to a misunderstanding. Before the entrance ceremony, she ran into a puzzling, but beautiful boy-like girl. Later, the school president smiles at her, and she can't stop the sudden pounding in her chest. Though self-proclaimed straight, thus begins her yuri life.

Fujii Kanae just broke up with her boyfriend, when her older sister Mizuho calls her to ask for her hospitality for her and... her girlfriend. How will Kanae, who hadn't ever imagined her sister to be a lesbian, cope with this cohabitation?

A short oneshot about the idols Koyori and Yuwa, whose relationship isn?t quite like what it appears.