Sasaki, a nearly 40-year-old, somewhat inconspicuous ordinary company employee (corporate slave), was influenced by a colleague who had a pet and decided to keep a pet. He accidentally met a munia, Xiaobi, in a pet store and bought it. But in fact, Xiaobi was actually the reincarnation of a sage from another world and had the special ability to communicate with humans. In this way, Sasaki and Xiaobi began a new story of traveling back and forth between another world and the real world.