父が再婚したタイミングで寮制の学校に入学したはじめ。距離が離れていても義母・めぐりとも円満で、密かに憧れを抱いていたがずっと胸に抱いたままだった。そして学生生活も終わりを迎え卒業式当日。笑顔で道の向こうからやってきたのは、めぐりであった。義母への秘めた想いが燻ぶり始めたはじめを見透かすように「義母さんからの卒業祝い」と優しくキスを…。そして少年はまた一つ大人の階段を上るのだった。

Hajime enrolled in a boarding school when his father remarried. Despite the distance, he had a harmonious relationship with his stepmother, Megumi, and secretly harbored feelings for her, which he kept hidden in his heart. Then came the end of his student life and graduation day. Megumi came walking towards him from across the street with a smile. As if seeing through Hajime's smoldering feelings for his stepmother, she gently kissed him, saying, "This is your stepmother's graduation gift." And the boy took another step towards adulthood.