Waking up after one sleep, an ordinary person accidentally transmigrated, turning into a tiny cockroach. Trapped in a dilapidated rented room, exploring two connected rooms across a partition wall hole, struggling to survive in an upside-down parallel world. Huge humans, fatal Milky Way insecticides, and garbage hidden everywhere harbor crises. From an insect's perspective, he must find a way to return to his original world, opening an absurd and oppressive otherworldly adventure.