My childhood friend, who used to like my thick penis, has evolved into a man with a huge, lustful penis, and thus becomes addicted to unprotected sex… (Marina Hyakuno, JUR-685)

Marina, married for 10 years and living a cold and distant life, is approached by a stranger on the street one day. The man is Haneda, her childhood friend from 20 years ago, who had feelings for her. He's grown into a handsome and muscular man, a far cry from his younger self. Then, while her husband is away, she lets Haneda shower in the rain, and accidentally witnesses something... Marina loses her temper, completely unable to comprehend the massive size of Haneda's penis, a far cry from the thick penis she'd seen together in the bath as a child...