Nanana's Buried Treasure

A disowned teen hunts a murdered ghost's reality-warping treasure collection with a theatrical detective.

Nanae Island was built by the Great Seven as a utopia for young dreamers. Juugo Yama arrives disowned and exhilarated — free of his father at last. His new room comes with a bonus: the ghost of Nanana Ryuugajou herself, murdered and bound to the island a decade prior. Before she died, Nanana hid her Collection across the island — artifacts that warp reality, grant impossible abilities, and whisper of the killer's identity. Juugo partners with Tensai Ikkyuu, a self-styled master detective who solves crimes through lateral thinking and theatrical flair, and Daruku Hoshino, her cross-dressing maid/assistant/enabler. The hunt begins. A-1 Pictures crafts a treasure hunt that's less about the loot and more about the hunters. Each Collection item reveals something about the seeker: greed, grief, the need to prove worth. The mystery unfolds in puzzle-box layers, rewarding attention without demanding encyclopedic knowledge. Tensai's deductions feel earned, not scripted, and her dynamic with Juugo — equal parts intellectual sparring and genuine care — anchors the supernatural shenanigans. Nanana herself, floating through walls with a pudding obsession and a tragic core, haunts the series in the best way. Eleven episodes leave threads dangling, but the journey — neon-lit nights, riddles whispered in abandoned classrooms, the thrill of a clue clicking into place — lingers like the taste of a puzzle half-solved.

A lighthearted mystery-adventure where a high schooler teams up with a ghost girl and a quirky detective to hunt magical artifacts on an artificial island. Expect moderate fan service, mild action violence, and a murder backstory handled with a playful tone rather than darkness.