Caught between his studious older brother and his handsome younger brother, Tsuchiya Yuuto is a first-year middle school student who is heartbroken and deplores his life being over. One day, he hears that Miyamoto Kohaku, a world-famous ballerina living next door to him, has retired due to an injury and has returned to Japan all alone. Yuuto decides to visit her, wanting to see someone whose life is even more over than his, but what he finds there is…? This is a story about two neighbors, neither family nor friends, with a large age gap, who rediscover this world in the process of searching for the Unmapped Place (Izuko), an urban legend popular in their childhood.