While Yuzu Hodaishi (Riho Sayashi) tried to find a decent job, she became hooked on a novel about yoghurt and became a big fan of the bacteria lactobacillus bulgaricus that appeared in the novel. Meanwhile, I is a lactobacillus bulgaricus and sees Yuzu Hodaishi. I jump out of the package of yoghurt and follow her as an invisible presence. After a year of trying to find a job, Yuzu Hodaishi finally gets hired by a food company in Meiwa and gets assigned to work for the company in Osaka. At first, she worked with the supermarket staff, but she was transferred to the PR department at the head office in Osaka. Her senior there is Itsumi Midori (Rio Asumi). Yuzu Hodaishi struggles with her life in unfamiliar Osaka and also her work in the PR department. She then gets assigned to work on a magazine article for Meiwa Yogurt's 50th anniversary.