For ten years, the younger sister has supported her sensitive, reclusive brother. Though mocked by others as a NEET, to her he has always been a kind and cherished presence. Whenever she faced heartbreak with boyfriends or struggles at work, on the verge of giving up, her brother would comfort her with handjob sessions. Over time, their bond crossed a line, evolving into a sexual relationship through which they emotionally sustained each other. This work portrays how, over a decade, their sibling bond deepened into a unique form of love.