Nanako is a 16-year-old girl with sweet and generous qualities. She desires to be loved by others, even if it's just a little bit. However, she doesn't intend to harm anyone. Suddenly, Nanako finds herself in a world that could change her deeply as she becomes a member of the Sorority, an exclusive school organization for the richest, most beautiful and sophisticated girls. Her admission is decided by Lady Miya, which sets off a storm of envy, "retaliations," and threats from other students. Nanako's disbelief turns to desperation as she loses Tomoko's support and faces excessive attention from Mariko Shinobu. She finds comfort in writing letters to her "dear brother" Takehiko, the friendship of Kaoru who protects her, and her deep interest in Saint Just, a charming and mysterious figure who Nanako probably feels closely connected to in her sufferings.