Sorako, an ordinary office lady, enjoys hiking. While hiking, she meets a mysterious child. He has beautiful silver hair and rainbow-colored eyes. Sorako names the orphaned child "Gin" and decides to raise him. He was small at first, but after a year he easily surpassed Sorako in height. [Something human-like, but not human] ──It seems that he is that kind of being. One night. "When I think about Sorako, something... well, my penis feels strange." After hearing this shocking confession, Sorako immediately decides to teach her sex education and how to masturbate... Gin gradually begins to feel lust for Sorako as his body grows. However, Sorako, who only sees Gin as a family member, cannot hide her confusion. Gin uses his supernatural powers against the indecisive Sorako. Suddenly, regardless of her will, Sorako's body began to ache uncontrollably...