Her husband brings his brother-in-law Yuji home for the first time in a long time. His wife Aya welcomes him with joy at their reunion, but... Aya, who is weak to pressure and easily influenced by other people's opinions, is swayed by Yuji's sweet words, who knows about her infertility problems, and timidly opens her legs. His persistent and precise caresses, which skillfully melt her body, gradually make Aya's sexual desire rise from within her body. Before she knows it, her body, which has been continuously developed, is being overwhelmed by the stimulating infidelity with her brother-in-law...