After marrying her childhood friend, Mizuki moves into his family home. On the surface, their marriage is happy, but there is one worry. Her brother-in-law, Kazuo, has become a recluse. Worried about Kazuo, who was also her longtime friend, Mizuki makes up her mind and heads to his room. There, she learns the reason for his recluse, and is perplexed, but tells him that she wants to help him somehow... Enraged, Kazuo forcibly kisses Mizuki. His persistent and passionate kiss, something that her husband does not have, gradually makes Mizuki's body feel hot...