Description：One day, Oyama Shinhiro, a stay-at-home resident who lives off his parents, wakes up and finds himself turned into a "girl"! ? Just when Shinhiro is confused because he doesn't know that the beautiful girl in the mirror is himself, his scientist sister Oyama Minami appears. She revealed that she added a strange drug to the drink! Shinhiro has been crazy about staying at home and playing porn games for the past two years, and only works occasionally when he has to! Shinhiro, who suddenly becomes a girl and starts his life, has no idea about women's lives such as toilets, bathrooms, skirts, bras, etc.... And he knows Minami's junior high school classmate Hozuki Kaede and her sister Hozuki Kaede. Shinhiro's daily life gradually becomes lively. In the continued suffering, what will be the fate of the "former" brother...!