Set in the red-light district of a heightened world that mischievously blends live action and animation, One Happy Customer follows the daily routine of an older sex worker. Luring clients in, snatching up their cash, and using her special trick to leave them satisfied—and more importantly, to get them out of her hair as quickly as possible. She’s listless, even bored.

It’s business as usual, until one customer—an old, seemingly decrepit man—arrives looking for something more. And he’s got a trick or two of his own to impress the woman who’s seen it all.