Tanaka's role as a sexual advisor is put to the test when the mothers of his clients, Natsumi Obata and Reika Kurashiki, decide to personally evaluate his skills. While Natsumi is quickly won over by his prowess, Reika initially approaches him with hostility and suspicion. However, her attempt to prove Tanaka's incompetence quickly turns into a passionate encounter, leading her to demand a final "test" of his ability to fertilize her.