とある日のマルゴーマルマル。夜が冷えてきたのでこっそり暖を取りに来た榛名ちゃん。

彼女がはだけた胸元に気づくのはもう少し後の話。

5:00 AM on a certain day. Haruna-chan who stealthily came to me for warmth because the night was getting cold.

After a bit of chat, she notices that her breasts were exposed.