After school, Yuuji and Tsubasa witness their friends kissing and they decide to vent their frustration at a karaoke box. When Tsubasa takes off her clothes in the room with a broken air conditioner, her dazzling, sun-kissed skin and competitive swimsuit are revealed! Both flustered by the kiss they just saw and the heat in the room, a playful accidental tit-touch escalates into full-blown action—!?