Sawaki's ability to see microbes stops being the show's secret weapon and becomes background noise, which drains the weird charm that made season one work. The fermentation process itself becomes the real protagonist, and while watching mold transform soybeans into something alive is genuinely fascinating, it's not what you signed up for. If you loved the character chemistry and supernatural absurdity of the first season, Returns feels like showing up to a party where everyone's suddenly interested in discussing pH levels instead of each other.
Sawaki Tadayasu returns to Professor Itsuki's lab, where his bizarre ability to see and speak with microbes finally has a practical purpose. The professor's fermentation facility is now operational, and Sawaki's ragtag circle of students is ready to put his gift to work: crafting soy sauce, sake, and other fermented staples while literally communicating with the microscopic organisms making it all happen. What begins as straightforward food production quickly spirals into chaos. The students discover that microbes have personalities, opinions, and attitudes about their jobs. Some are cooperative. Others are difficult. A few are outright mischievous. Sawaki finds himself mediating between his friends' ambitions and the stubborn bacteria and fungi that actually control whether fermentation succeeds or fails spectacularly. This season trades the school setting for hands-on experimentation, mixing comedy with genuine science education. The humor comes from watching overconfident students learn that microbes couldn't care less about human expectations. Expect absurd situations where fermentation goes hilariously wrong, character growth through failure, and the constant reminder that nature always has the final say.