Kimura happens to be walking down the halls after school and comes across a very unapproachable honor student, Koikeda Keiko. Just a normal passing until Kimura happens to notice, Keiko isn't wearing any underwear. The next day, Kimura can't get the image out of his head and what's worse is she's in his class. While trying to figure out what all this means, Keiko comes to his desk wondering why he's staring at her and also if she could speak to him after class... Thus our story unfolds.