"My boyfriend who was supposed to be an adult suddenly became a child...!?"

My favourite lover came to stay at my house for the first time. Tsugumi's chest swells in anticipation of her first sex with him, which she had longed for.
Slowly pushed down on her bed, at that moment when I thought it was finally... a mysterious handsome boy appeared in front of her.
Surprised, Tsugumi searches for Yutori, her lover who suddenly disappeared, but he is nowhere to be found in the room.
Meanwhile, when I called his name, for some reason the boy answered...! ?

大好きな恋人が初めて家へお泊まりに来た。念願だった彼との初エッチに期待で胸が膨らむつぐみ 。
ベッドにゆっくり押し倒され、いよいよ…と思ったその瞬間、目の前に謎の美少年が。
驚きながらも突然いなくなってしまった恋人・遊鳥（ゆとり）を探すつぐみだが、部屋中探してもどこにもいない。
そんな中、彼の名前を呼ぶとなぜか少年が返事をしてきて…！？