あらすじ
"Kei-chan, see you tomorrow!" — That promise was never fulfilled, and young Kirishima Keisuke was separated from his only close male friend, Maa-chan. Then, ten years later, the person who arrived due to their parents' remarriage was none other than Maa-chan—now Masaki—who had grown into a charming and outgoing beautiful girl! While Keisuke, who had always mistaken her for a boy, is confused, Masaki begins interacting with him even more closely than before, as though they were siblings. Playing games together, eating meals together... and even trying to bathe together!?
あらすじはAniListより（英語）。
データベース内の関連マンガ
自社カタログから選出 — 同じ作者、またはジャンルの重なり。