Nanana's Buried Treasure - S01

Nanae Island is an artificial island in the Pacific Ocean designed to provide children with education and opportunities to pursue their dreams. It was built by the Great Seven, a team of adventurers led by Nanana Ryuugajou. High school student Juugo Yama, disowned by his family, arrives on the island, relieved to escape his father’s control. When he moves into his new room, he meets Nanana’s ghost-still lingering on the island since her unsolved murder ten years earlier. Nanana reveals that before she died, she hid powerful artifacts called the Nanana Collection all over the island. Determined to find clues about her killer, Juugo teams up with the eccentric "Master Detective" Tensai Ikkyuu and her maid Daruku Hoshino, who disguises herself as a boy. Together, they begin their search.