陽波とるいは従姉妹。お互いに一人っ子で小さい頃からまるで姉妹のように仲が良かった。2人は様々な経験をし、お互いに性癖も確立していった。るいは男女問わずセックスに明け暮れ、陽波は男運に恵まれず男に嫌気がさし、気がつくと百合の世界への憧れが芽生え始めた。るいはそんな陽波を徐々に百合に世界へと誘う。
Hinami and Rui are cousins. Both only children, they have been close like sisters since they were little. The two have had various experiences and have established their sexual preferences. Rui is obsessed with sex, regardless of gender, while Hinami has had no luck with men and has become fed up with them. Before she knows it, she has begun to long for the world of yuri. Rui gradually invites Hinami into the world of yuri.

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