Riho has never known any man other than her husband. She married her first love and has been married for 13 years. She had devoted herself to him for years. As long as she had a kind husband who always thought of her, that was enough. The only thing Riho felt guilty about was that she couldn't have children. But even that wasn't mentioned by her husband. Riho had never doubted that their love was mutual, but one day, a trivial incident made her suspect her husband of cheating. Then, on the night her suspicions turned to certainty, Riho confessed her feelings to her husband, and he left the house, criticizing Riho for not being able to have children. In despair, Riho searched the web for her husband's cheating. Then she found out about a certain app. She registered without much thought, and met a man named Sera. Riho left the house, relying on Sera...