Kazuya, an idol otaku, feels disgusted that his friends see his young and beautiful mother in a sexual way. However, one day, he witnesses his friend Tadashi, unable to resist, squeezing his mother's big breasts and forcing her to give him a blowjob. Since then, Kazuya begins to think of his mother as a woman, and becomes more interested in the body of a woman he is closer to than an idol he cannot touch. He invites his mother to take a bath with him for the first time in a while, and is captivated by her young and beautiful body during their first bath together in several years, and he takes his virginity.