Japan's best-selling high teen novel!! A delightful series of events unfolds with the new members of the Sanbaiyukai at a charming girls' school! Nana, who has become sisters with Rosa Petida Yoshino, is a member of the kendo club. She visits the Rose Hall in search of her sister, who hasn't shown up for club activities. However, she learns from Noriko, a member of the Rosa Kikan Tea Club, that Rosa Petida is not present. Nana searches the school with Noriko, but one by one, the Rose sisters who joined them start to disappear…?! This collection includes five slightly mysterious stories set in Lilian Girls' Academy!