A ghost locked in a room with a student who just moved into her apartment decides their only option is to solve mysteries together, one buried treasure at a time. The show treats each puzzle like it actually matters, then pivots into something deeper about why the GREAT 7 needed to build an island in the first place. Eleven episodes is genuinely not enough, but what's here moves with the energy of something that knows exactly what it is: a mystery-comedy that refuses to pick a lane and somehow pulls it off.
Jugo moves to Nanae Island seeking a fresh start after his father casts him out, hoping to disappear into the island's thriving student population. His plan for anonymous solitude crumbles the moment he discovers a ghost haunting his apartment: Nanana, a cheerful spirit who refuses to leave him alone. Ten years dead and murdered under mysterious circumstances, Nanana remembers nothing about who killed her, though she's determined to find out. She strikes a deal with the reluctant Jugo: help her uncover the truth about her death, and she'll stop making his life miserable. What follows is a treasure hunt across the island as the mismatched pair investigates Nanana's past while stumbling into increasingly bizarre mysteries. The atmosphere shifts between lighthearted comedy, where Nanana's mischievous antics drive Jugo up the wall, and genuine mystery as fragments of her story surface. Jugo finds himself drawn into Nanae Island's shadowy underbelly, where powerful forces may have wanted Nanana dead for very specific reasons. A supernatural mystery wrapped in humor, perfect for anyone craving puzzles, ghost humor, and the slow revelation of secrets.