JUQ-993 Yuki Yoshizawa, a married woman, is creampied by a younger man until he graduates after receiving a spare key.

Kenji, a single man, meets married Yuki Yoshizawa at a local izakaya after a falling out with her husband, and they become friends and then lovers. He gives her a spare key, and she visits him whenever her husband is at work, carrying a shopping bag. They spend intimate time together in his room, easing their loneliness, with creampies continuing until his graduation, over 159 minutes.