Nanana Ryuugajou is the titular character of the anime series 'Ryuugajou Nanana no Maizoukin' (Nanana's Buried Treasure). She is a ghost who haunts Room 202 on Nanae Island after her mysterious death. In life, Nanana was a brilliant young woman and the founder of the island, famous for creating a collection of powerful artifacts known as the Nanana Collection. As a ghost, she befriends the protagonist and aids him in uncovering the secrets behind her treasures and her own murder.