There's a donut shop called "I'm donut?" The shop is filled with a sweet aroma and there's always a queue outside. Donut lover Tsubura finally gets to work at "I'm donut?" However, Ryo, the senior employee in charge of the shop, is skilled but quiet and unsociable. The two workers clash repeatedly, but donuts eventually bring them together. Then, Makia, a demon with a love for sweets, visits "I'm donut?"