Otagai ni kareshi-mochi dakedo, onnanoko aite nara uwaki ni naranai yo ne? Tomodachi doshi datta kedo kisu de ikki ni kyori ga chijimatte ichiya‑giri no rezubian ni naru shunkan: Seto Hinako × Shiraishi Momo.

Hinako and Momo meet through work and naturally become close friends. Although both have boyfriends, one evening, they confess over drinks that their boyfriends have cheated on them. They go to a hotel and an impulsive kiss shifts their relationship into something more intimate, leading them to share a night that changes everything. Through that time together, they discover new feelings and a closeness that reshapes their friendship.