​Tomohisa and Endou are ordinary boys, neither good-looking nor ugly, just your average students. They can’t help but be captivated by the stunning beauty of Mizuho, a senior student, and Mikura, their classmate. Mizuho, a returnee student, catches their attention and gives Tomohisa a suggestive glance. Curiosity gets the better of him when he discovers a note in his desk, inviting him to meet someone in the third-floor ladies’ room. He follows the mysterious invitation and is surprised to find Mizuho waiting for him. The next day, Tomohisa can’t shake off the memories of their encounter. To his dismay, he realizes that both Endou and Mikura, the girl he secretly adores, are missing. Fearing the worst, he sets out to find them, only to stumble upon their steamy rendezvous on the fire escape.​