SSPD-147 [Reducing Mosaic] A two-night, three-day hot spring trip where she was cuckolded by her brother-in-law. Tsumugi Akari was trapped in the hot spring.

A two-night, three-day hot spring trip planned by Rie's husband, Kengo, and his younger brother, Yuji. - This inn, surrounded by rich nature, is a place where Kengo and Yuji have fond memories of being taken by their deceased parents when they were young. - The worst incident that happened in such a memorable place. - Rie runs into Yuji without realizing that the men's and women's baths are swapped. - Seeing Rie's body for the first time, Yuji is unable to suppress his desire and attacks her.