Satoru Mikami, a 37-year-old virgin, is stabbed to death by a robber while walking home. Expecting to be reincarnated as a slime in a fantasy world, he instead awakens in 1984 as Kosaku Shima, a section chief at a major Japanese electronics conglomerate. Rather than gaining magical powers and building a monster nation, he must navigate the realities of corporate Japan: office politics, long hours, strict hierarchies, and the pressures of being a salaryman. This crossover parody blends the isekai premise of That Time I Got Reincarnated as a Slime with the long-running business manga series about Kosaku Shima. The story follows Satoru's confusion and adaptation as he trades potential dragon lords for division meetings and slime skills for business etiquette, all while trying to make sense of his new life in the bubble-era 1980s. The manga is a short, two-chapter comedic spin-off that plays on the sharp contrast between the fantasy adventure Satoru expected and the mundane yet demanding world of Japanese corporate culture.