Subtle, a girl who is so unnoticeable you need to be close to her to even see a speck of her face, is trying to get Resolution, the class president to notice her when a new girl arrives. The new girl calls herself Enigma, and even though all she shows is the back of her head, most are enraptured by her. Subtle plans on digging up dirt on Enigma out of jealousy and starts looking for clues.