After 17-year-old Machi finds herself unable to speak following a traumatic friendship breakup, she prays to the Japanese goddess Benzaiten for one thing: to become a robot vacuum cleaner. When she accidentally invokes the deity, Benzaiten makes it her mission to show Machi that life is worth living.
Benzaiten is enamored with the human world, and, as she's the goddess of love, humanity is enamored right back. Yet with each adventure they share, Machi is reminded of everything she's lost. It isn't until Machi starts interacting with the souls of the dead—a byproduct of being around Benzaiten—that she starts to rediscover her place among the living.
