Mukashi no Otoko Tomodachi to Doukyo wo Hajimetara, Jitsu wa Bishoujo Datta: Kyori-kan ga Ano Koro no Mama de Chikasugiru

Keisuke and Masaki were childhood friends, but their time together ended abruptly. A decade later, Masaki returns to Keisuke's life after their parents remarry. Keisuke, who once believed Masaki was a boy, is surprised to find her now grown into an attractive young woman. Masaki acts as close to Keisuke as before, treating him like a sibling. They spend time together playing games, eating meals, and even attempt to bathe together. Living together, they experience a familiar comfort, as if no time has passed. However, the reality of their changed relationship and shared living space creates new awareness between them.