He visits a soapland to lose his adult virginity and meets a busty worker calling herself Yui. She is cute, gentle, and so good with her body that he falls for her before the session is even over. When she accepts his feelings and asks him to call her by her real name, Karen, they begin a happy relationship that feels like a dream. But Karen still goes to work every day and gets held by other men. A tender, painful first-love drama about falling for the sex worker who gave him his first time.