Ryuugajou Nanana no Maizoukin, also known as Nanana's Buried Treasure, is an anime series that explores the adventures of Juugo Yama, a high school student who moves to a special student zone. He discovers a ghost named Nanana Ryuugajou, who was murdered in the past. Together with his friends, Juugo seeks to uncover the truth behind Nanana's treasures and her mysterious death.