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Roten no Tsuki
露天の月
Shouta is on a hot springs trip with Mashiro, his girlfriend of three years. He looks forward to a relaxing getaway, but soon finds himself unable to enjoy the trip. The reason is that he stumbled upon some "sex complaints" posted on Mashiro's secret account. Hurt and betrayed by her online confessions, Shouta feels his trust shattered.
Determined to get revenge on his sexually frustrated girlfriend, Shouta decides to use toys to teach her a lesson. As the tension between them grows, their hot springs trip turns into a confrontation fueled by desire and resentment. What started as a romantic escape becomes a battle of wills, where pleasure and pain intertwine in unexpected ways.