Maiko Fujimiya is an ordinary high school girl who wears glasses and keeps a weird hobby secret: she loves to stare at girls' asses while going upstairs in the train station.

One day, a beautiful girl with blonde hair, who Maiko thinks has the perfect ass, asks her if she's been staring at her ass frequently. It turns out the blonde-haired girl loves being stared at, so the two hit it off.