Yū Kashiwagi, a delicate new student at an all-girls academy, navigates school life while managing a fragile health condition that demands persistent rehabilitation. Her journey intertwines with Hatsune, a supportive upperclassman in the dormitory, and Chihaya, a peer she reverently addresses as “Tenshi-sama” — “angel” — a title reflecting her awe of Chihaya’s perceived purity. These connections become catalysts for her incremental progress, bolstering both her physical resilience and sense of belonging. Her story unfolds within the PSP iteration of the series, where her evolving bonds and personal strides are framed by the school’s social tapestry, underscoring her growth without elaboration on other adaptations.