Ryuugajou Nanana no Maizoukin

Seven students, known as the GREAT 7, initiated a project to create Nanae Island, an artificial island designed to help young people pursue their dreams. Twelve years later, the island is home to 100,000 people, 80% of whom are students. Jugo Yama, a high school student recently disowned by his father, moves to the island and discovers the spirit of Nanana Ryugajo, the island's late founder, in his apartment. Jugo's plans for solitude are disrupted by this unexpected roommate. The story follows Jugo's journey as he explores the island's ruins in search of the "Nanana's Collection," a set of treasures, alongside other notable characters. The anime includes puzzles, treasure hunts, and intellectual challenges between characters.