MFYD-167 I was caught peeking at my older sister, a big-assed, sexually depraved girl, masturbating, and she forced me to straddle her while I was drenched in sweat, and then she devoured me again and again with her beastly pile-driving press during my summer homecoming. - Hasumi Claire

Returning home for the Obon holiday after several years away in Tokyo for university, Souta felt a sense of comfort at the unchanging scenery of his hometown, his first visit in three years. However, the person he encountered upon returning home was his older sister, Claire, a woman in her late twenties, wearing her high school class T-shirt and living in a messy room. Having divorced while Souta was in Tokyo, she had become a lonely, unattractive woman who spent her days watching BL (Boys' Love) movies. One day, he happened to peek into his sister's room and witnessed her masturbating, sweating profusely and exposing her enormous buttocks. Unable to take his eyes off his sister's perverse masturbation, he was discovered by her and forcibly dragged into her room...