As graduation day approached, Yu was about to embark on a new journey after his solitary student life at the dormitory came to an end. On that very special day, it was none other than his beloved stepmother Haruka, whom he secretly harbored feelings for, who ran towards him with a beaming smile. They spent their time together celebrating his graduation, but due to her overwhelming joy at witnessing his growth, Haruka became quite tipsy. Determined not to let anything happen, she sent him off to a hotel. However, Haruka had noticed Yu's feelings all along and gently kissed him, saying, "A present for you, my grown-up Yu."

寮で一人暮らしの学生生活も終わり、まもなく新たな旅立ちを迎えるゆう。そして卒業式当日、道の向こうから笑顔で駆けてきたのは、密かに恋心を抱いてた義母・はる香だった。卒業祝いを2人で過ごすのだが、彼の成長を喜ぶあまり、無防備なはる香は酔いつぶれてしまう。邪な心を必死で払い、ホテルに送るゆう。しかし彼の気持ちに気づいていたはる香は「大人になったゆう君へプレゼント」と優しく口づけを交わして…。