This work depicts how rationality, usually suppressed, collapses on the day parents leave for a trip, rapidly accelerating the relationship with a stepsister. Played by Yokomiya Nanami, the stepsister initially gives a pure and modest impression, but gradually switches on her erotic side, transforming into a bewitchingly attractive figure. She has a slender, petite build paired with firm, well-proportioned breasts and a cute voice, with moans that are irresistible. The scenarios unfold all over the house, featuring varied positions like missionary, cowgirl, standing doggy style, seated on the sofa, and spread-legged insertion in the bathroom, repeatedly culminating in creampies. The natural progression from kissing to cunnilingus, fellatio, and 69 is meticulously portrayed, with the 69 scene while admiring her tight, lifted skirt-clad buttocks being particularly outstanding. The 24-hour, sex-filled carnal daily life is portrayed as a blissful time deepening the bond between lovers, with consecutive creampies ignoring pregnancy risks enhancing the realism. Nanami's balance of innocence and seductiveness is exquisite, allowing full enjoyment of her charm as a sister role.

Through this work, the tension and liberation of secretly nurturing a romance under one roof are palpable, making the couple's mutual enjoyment of sex enviable. Nanami's matured acting and cuteness shine, resulting in highly satisfying content that leaves viewers eager for more sequels.