Souta Tawara leaves behind the chaos of Tokyo, returning to his hometown in Kagawa Prefecture, where the memories of his family remain despite their absence. When he visits his childhood home and the family-run udon shop, he discovers a small, disheveled boy sleeping inside the restaurant.
At first, Souta simply gives the boy some food and clothes without much thought. But then the child suddenly develops furry ears and a tail, revealing himself to be the legendary shape-shifting tanuki that has lived in Kagawa for centuries. Feeling compassion for the seemingly lonely being, Souta decides to take the boy in and names him Poko.
"Poco's Udon World" follows the growing relationship between Souta and Poko. As they spend more time together, Souta reflects on his past, the home he left behind for city life, and his connection with his father.