Kiraboshi Nadeshiko and her best friend Mangetsu Sakurako are finally achieving their lifelong goal of attending their dream school, Kiraboshi-juku, in order to become idols. The two girls are inseparable, to the point where others often compare them to a married couple.
As they settle into their new life in the school's dormitory, they become roommates. However, on their very first night, Nadeshiko experiences an unexpected and forbidden urge...