Kamono-san's day begins with a provocative encounter with a pharmaceutical saleswoman who tricks him into a costly subscription for a performance drug. However, his luck shifts when he reunites with Chizuru, a childhood friend he hasn't seen in years. As they spend the night together, their old bond evolves into a passionate adult relationship.
This episode features two stories of evolving relationships through sexual exploration. Seo, a reserved loner, is befriended by Yui and Megu, who eventually turn him into a "boytoy" for the school's girls before reaffirming their friendship. Meanwhile, Masa attempts to get closer to his childhood friend Minori by intentionally delaying her orgasms, ultimately transforming her into a nymphomaniac and forging a deep, passionate bond.