Kasumi seems mousy and unassuming, but there's a head-turning beauty behind her fogged-up glasses and pinned-up hair. Unfortunately, Ryohei's a bit slow on the draw - by the time he takes notice, she's in a lovey-dovey relationship with his childhood friend Kentaro, who heroically jumped in to save her from a train molester. Jealous that his nerdy best friend is crushing more pussy than he could ever dream of, Ryohei pockets some spicy sexts he found on Kentaro's phone as blackmail and cooks up a scheme to steal her away.