The one who killed the dark beauty who disrupts people's destinies, Black Rose, is "me"――!? Renna Matsuoka, who transferred to Fuyou Girls' Academy, reunites with her acquaintance from elementary school, Kaeko Daimai. Kaeko, who was called "Lady Black Rose" and was an object of admiration for the students, had been worried about Renna, who moved away from this town during their elementary school days. A beautiful, mysterious, and kind-hearted perfect girl, Black Rose. However, Renna knew about her hidden other side――. One night, Renna is summoned by Black Rose to come to the park alone. What awaits her there is an invitation to a murder matching site called "Black Black Lotus"…….