After the sushi restaurant he worked at went under, Tsurugi ended up moving in with his older brother and sister-in-law. While his sister-in-law Maya warmly welcomed him, his brother constantly belittled and berated him. Over time, Tsurugi found himself deeply moved by Maya's gentle demeanor, and due to prolonged sexual frustration, became intensely aroused by her thick, shapely ass. One day, concerned that Maya hadn't come out of her room, he peeked inside and found her pants tangled around her thighs, leaving her stuck and unable to move. With her pants half-lowered and her ass thrust out, Tsurugi moved to help—but could no longer hold back his urges and gave in completely.