During a school trip, a young couple, Hina and Ryo, finds themselves hiding together in a room while their friends are nearby. What begins as Ryo’s determined attempt to share their first kiss quickly escalates into a passionate and risky sexual encounter, which they must keep quiet to avoid being discovered.

The story continues to show their relationship becoming increasingly physical and daring, as Ryo later persuades a reluctant Hina to have sex with him in a school classroom. Their intimate moments are filled with a mix of anxiety and excitement, driven by the thrill of potentially being caught. Despite Hina’s initial protests and embarrassment, she ultimately gets swept up in the passion, confessing her love for Ryo during their encounters.