Fukaya is in a confusing relationship with the aloof and beautiful Fujino, who seems more interested in her vibrator than in him. Struggling with feelings of inadequacy and wondering if he is merely a "toy" in her eyes, Fukaya attempts to bridge the gap during a trip to the pool. While he eventually finds some validation in Fujino's desires, her relentless obsession with her gadgets keeps him perpetually on edge.
Mita disrupts the relationship between Fujino and Fukaya by introducing a powerful aphrodisiac, leading to a series of uncontrolled desires and a betrayal of trust. After Fujino accidentally consumes the drug, Mita uses the same substance to seduce Fukaya, testing the strength of the couple's bond. Despite the chaos and Mita's interference, Fujino and Fukaya eventually reconcile and confess their love for each other, though Mita continues to linger in their lives.