[Machine Translation] The demon king was not supposed to have a "heart," but he does... A gem of a tale of interspecies exchange between humans and demons is complete. An ordinary day in the life of Buchio the Nekomata. People looking up at the big tree where a new tengu is born. In the midst of their repetitive daily routines, researchers investigate a strange phenomenon in the world. The disappearance of the Demon King and those who care for him. The "words and spirits", the "heart", and the desire to "stay here"... A spin-off of "My Neighbor's Yokai-san", a story we want to bring to you. The "My Neighbor's Yokai-san" series is finally complete. Includes 8 spinoff stories serialized in Web media "Mato Grosso" and one newly drawn story for the book. A TV animation of this work was broadcast in 2024 (currently being distributed).