As Tohko approaches graduation, a bittersweet feeling envelops him. During a New Year's gathering with Kotobuki, Konoha senses a subtle reduction in the distance between them. Yet, news of Kotobuki's sudden hospitalization leads Konoha to a surprising reunion with a girl from his past, her smile unchanged. This unexpected encounter triggers strains in Konoha's relationships, with her presence at the core. Amidst the unraveling bonds, questions arise about the girl's desires and true emotions, as envisioned by the enigmatic Book Girl. Delve into the anticipated fifth volume to uncover the truth hidden within.