Honoka and Takashi, coworkers who have long harbored secret feelings for each other, lived restrained lives bound by family obligations and limited freedom. For them, an affair was a forbidden indulgence they could barely afford. But one day, driven by the desire to spend time together without restraint or fear of being seen, they spent months secretly planning what they called a business trip—a cover for a forbidden hot spring getaway. On the day of departure, they met at the station, shed their work suits, changed into casual clothes, and boarded the shinkansen full of excitement, heading toward their destination. Upon arrival, the long-awaited moments they shared intensified their emotions, leading them to passionately kiss. Overwhelmed by desire, they let go of the guilt of infidelity and surrendered completely to their raw passion and love, lost in a world that belonged only to the two of them.