主人公の朋ほう太子だいし由ゆ寿ずは、就職活動中に読んだヨーグルトを題材にした創作小説にハマり、小説内で登場する“ブルガリア菌”の大ファンになる。そんな由寿を見た“吾輩”こと乳酸菌(ブルガリア菌20388株)はパッケージから飛び出し、由寿には見えない存在として彼女にとり憑き、行く末を見守ることに。就活と推し活に勤しむ中、1年後には老舗食品メーカーの「株式会社明和」へ就職し、晴れて社会人としての生活をスタートさせた由寿。同期たちが皆、人事部長からの辞令を受け取る中、由寿の勤務先はまさかの大阪に…。不安を抱えながら、新天地の大阪で社会人としての門出をスタートさせる。
Aliases
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.