Anzu is a high school girl living under the strict control of her mother, in a household where the idea of defying her will is unthinkable. With no smartphone and no allowance, one of her few escapes is sneaking away to a nearby CD shop and listening to music.

But one night, in the plaza outside a train station, she encounters a shady-looking guy who has the looks of a devil... but plays the guitar like an angel.