Miya and Kon are siblings raised by a master carpenter on a small island in another world. Two years have passed since their master left the island for a job assignment. During that time, Miya has grown like an ordinary human girl, but Kon’s height stopped increasing at some point, and his demi-human features—ears and a tail—became prominent. Although they have spent their lives together without ever doubting they were biological siblings, they begin to feel doubt and anxiety about their differing appearances. What destiny awaits these two—a novice carpenter girl and her little tanuki younger brother—who only wish to be of help to the island people they love so much...!?