Rika's Lustful Duty

Protagonist Naoki finds himself developing a fetish he doesn’t fully understand. - At times, vivid images of his wife with another man appear in his mind—images that, to his surprise, excite him. - For a while, he struggles to accept the thrill he feels from such an outrageous thought. - But eventually, he surrenders to his imaginations. - As he comes to accept this as a fantasy, - he realizes his friend Kenta is having frustrations because of his lack of success in dating. - Seeing his friend's struggles, an idea that is forbidden but undeniably thrilling, pops up in his head: - "What if my wife, Rika, were to help him?"​