Yuichi is in high spirits when his sister-in-law Hana comes to stay with him. It's been a while since he last saw her, but her huge breasts are still as big as ever, and he can't help but stare at them... That night, Hana accidentally sees her sister and her husband having sex, and as it's been a while since she's had sex with her husband, she spends a sleepless night in agony. The next day, Hana is drunk on her way home from a class reunion and can't forget what happened the night before. As Yuichi looks after her, she seductively approaches him, saying, "I've reached my limit...". Yuichi can't resist the charms of his sister-in-law's voluptuous body, which his wife doesn't have...