After a bug net accidentally jams a door, a boy and a girl named Sachi find themselves trapped together inside a cramped, sweltering enclosure. Fearing heatstroke in the intense summer heat, the pair decides to strip off their clothing, but the tight quarters and accidental touching quickly ignite a mutual physical attraction. Their initial awkwardness gives way to youthful impulse, and they decide to engage in a sexual encounter while waiting to escape.