Nanana's Buried Treasure

High school student Juugo Yama moves to Nanae Island after being disowned by his father, expecting to live on his own. Instead, his apartment is already occupied by the earth-bound spirit of Nanana Ryuugajou, whose idea inspired the island's creation. Juugo is soon drawn into searching Nanae Island's ruins for the mysterious treasures known as Nanana's Collection.