In Rika’s Lustful Duty, Naoki begins to develop a fetish he can’t quite comprehend. Vivid visions of his wife with another man intrude on his thoughts, disturbing at first, yet strangely arousing. Though he wrestles with the idea, he eventually embraces the thrill of the fantasy.
Meanwhile, his friend Kenta struggles with constant failures in dating. Watching Kenta’s frustrations sparks a forbidden but tempting thought in Naoki’s mind: what if his wife, Rika, could be the one to help him?