A high school girl becomes involved in a murder mystery that revolves around a dating simulation game that has currently become popular on mobile phones. A woman who seemingly exists only as a character within the game is somehow killing all the male players one by one.

Takahiro Abe, a regular high school boy, has a crush on Rumi Asai, who happens to be a hardcore, yaoi-loving, otaku-ish fujoshi. Her biggest fantasy is Abe and Shunsuke Chiba, the handsome class playboy, having homosexual affairs. To make things more complicated, Yōko Matsui, class babe, accidentally reveals herself as an otaku-in-closet, and befriends Asai... more so than your regular girl-girl friendships.