A story about two coworkers, Ryuunosuke and Rei, who have been secretly seeing each other for two years despite having partners. They decide to end their relationship due to Rei accepting her boyfriend's proposal just before they move apart. As their last date, they spend a night at a hotel where they engage in passionate unprotected sex, wanting to experience what it's like to be a live-in couple. Note that the recording contents may vary depending on the distribution method used.