Japan's best-selling high teen novel! A charming series of events unfolds at a ladies' school! We invite you into the secret world of girls. With just two days until graduation, Yumi feels lonely at the thought of the Rose Ladies graduating. However, Rosa Kinen-shisu (Hongjangmi) makes a statement that intensifies Yumi's loneliness... Finally, the graduation ceremony begins with Sachiko's lawsuit, but an unexpected incident occurs on stage?! The story also includes the first meeting of Rosa Kikan Tea (Baekjangmi), Sei, and Shimako, leading up to the sisters' vow.