Sora Amagawa, a golden sister in the village of stealing boyfriends.

The younger sister of his girlfriend is innocent and always trusts him completely, but unexpectedly, it's the older sister living under the same roof who makes him unable to hold back. With her confident demeanor, sharp gaze, and provocative behavior, the older sister seems to challenge all boundaries in this relationship.
At first, it was just fleeting encounters, but gradually, the two began to secretly exchange suggestive glances. The contrast between the gentle younger sister and the bold older sister creates a strange attraction, making the young man feel trapped in a whirlpool with no way out.