Shu Hashimoto, nicknamed the Prince, is the top earner and well-received by his female co-workers, has secret he cannot tell to anyone. His libido is stronger than average. He tries to train his nipples with toys he bought but to no avail, leading to days of sexual frustration. One day, a new recruit named Yoshitaka Ichimiya joins the company and Shu is tasked to help him get onboard. Shu impressed with Yoshitaka for being a fast learner is asked a shocking question: "How's your nipple training going, Mr. Hashimoto?" Things don't end there as Yoshitaka plays with Shu's sensitive nipples which felt much better than doing it by himself! Shu, confused and cannot resist, is at the mercy of the new recruit, Yoshitaka.