Japan's best-selling high teen novel!! A charming series of events unfolds as the new members of the Sanbaiyokai navigate their lives at an all-girls school! Rosa Kinen-shisu Sachiko and Rosa Petida Reido are finally graduating. Yumi, who is in charge of giving flowers to the graduates, visits the third-year Pine class where her sister is, and receives something from Sachiko…?! Meanwhile, the flower representative for the Chrysanthemum class, Rei, is not Yoshino but Tanuma Chisato?! The former members, Sei, Yoko, and Eriko, gather at Lilian Girls' Academy, cherishing their memories as they face the moment of farewell. "Goodbye, sister."