As the spring term commences at Lillian Girls' Academy, old friends reunite while the Yamayuri Council faces a poignant moment of departure. While Yoko, Eriko, and Sei get ready to leave, Sachiko, Rei, and Shimako strive to create a meaningful farewell. Sei's absence will deeply affect the White Roses, prompting a search for a worthy successor to the role of Rosa Gigantea en bouton that might capture Shimako's heart.