A two-night, three-day hot spring trip planned by Rie's husband, Kengo, and his younger brother, Yuji. Surrounded by abundant nature, this inn is a place of memories that Kengo and Yuji often brought to their deceased parents when they were young. The worst happening that happened in such a memorable place. Rie, who didn't realize that it was a men's bath due to the men's and women's exchange system, had a match with Yuji. Yuji couldn't suppress his desires and attacked Rie's body for the first time.