Saki, a sexually free sister, proposes a partner exchange to Mafuyu, her younger sister who is said to have a lack of desire. The sister says that partner exchange is the best way to resolve it. Indeed, Mafuyu and her husband are not in a good state. The cause is that her husband's own condition is not good. Although she feels confused, when she talks about the proposal from her sister to her husband, surprisingly, her husband says that it's not bad either. Feeling anxious, Mafuyu decides to try her sister's proposal....
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