The setting features a fair-skinned, black-haired, petite younger sister named Hinano, who worries about her brother, always studying and showing no interest in women, and provokes him with revealing acts like going braless to flash her chest or masturbating in front of a mirror. I watched this work too, and the development where the sister's pure concern gradually turns into illicit excitement is, in a sports newspaper style, as thrilling as a 'miracle comeback drama.' From Hinano's actions upon noticing her brother's agitation, hardcore scenes follow, including face-sitting, reverse cowgirl position, tongue-kissing handjob and blowjob, toy play, beautiful breast titty-fucking, and creampie & facial cumshots totaling 6 ejaculations. In the 130-minute long feature, the brother's confusion and uncontrollable erection in response to the sister's overly cute shaved appearance and breast service captivate viewers. Particularly, the contrast between the sister's innocent expression and intense acts heightens the sense of taboo, creating a gripping development akin to a heated sports match. Reconstructed as a review, this work can be called a masterpiece that skillfully depicts the subtle sibling relationship while exploding with eroticism.