Nono and Momoka, best friends and classmates, hit the karaoke bar, their laughter and singing filling the air. They're joined by a group of male friends, the atmosphere becoming charged with hormones and alcohol. Momoka, despite having a boyfriend, finds herself drawn to one of their friends, his advances making her heart race. As they sing, their bodies press close, his hands wandering. Nono watches, her own desires stirring, as Momoka succumbs to the moment, their karaoke session turning into a steamy, forbidden tryst.