Two nights, three-day hot spring trip, being cheated on by my brother-in-law, trapped in a hot spring

A two-night, three-day hot spring trip planned by Rie's husband Kengo and his younger brother Yuji. Surrounded by rich nature, this inn is a place of memories that Kengo and Yuji were often brought to their late parents when they were young. This is the worst incident that happened in this memorable place. Rie doesn't realize that the men's bath is being swapped with men's baths, and ends up running into Yuji. Yuji couldn't control her desires when Rie's body was seen for the first time, and she attacked her.