In the rural town of Fuchigamori, where humans, youkai, and gods coexist as a normal part of daily life, the side story collection Tonari no Yōkai-san Gaiden weaves together a series of short tales that deepen the world and its inhabitants. The stories shift focus among the familiar residents of the town, exploring their pasts, their hidden connections, and the moments that shape their futures. Buchio, the twenty‑year‑old cat who recently evolved into a nekomata, appears alongside the crow tengu Jiro, the human girl Mutsumi, the bake‑kitsune Yuri, the nose‑high tengu Tazenbo, and many others. Each chapter reveals a piece of the town’s history—encounters with wandering spirits, echoes of old conflicts, and the quiet bonds that tie the community together. The collection touches on themes of change, belonging, and the unseen threads linking the ordinary and the supernatural. Whether revisiting a character’s past or offering a glimpse of what lies ahead, the Gaiden enriches the larger story of Fuchigamori without following a single continuous plot, instead presenting a mosaic of moments that highlight the warmth and mystery of a world where the extraordinary is simply part of everyday life.