A spin-off light novel series titled Ikkyū Tensai no Kiwamete Fuhon'i na Meisuiri (壱級天災の極めて不本意な名推理, lit.

A manga adaptation by Hitoshi Okuda began serialization in Enterbrain's Famitsu Comic Clear web magazine in August 2012.

An anime television series adaptation by A-1 Pictures began airing from April 10, 2014, on Fuji TV's noitamina block.

[2] On the "Special Student Zone" artificial island Nanaejima, the story centers on a beautiful, optimistic, but NEET (not in education, employment or training) girl Nanana Ryūgajō, who was mysteriously killed in her own apartment.

With only a certain amount of money to live on, Juugo chooses a low-rent apartment that happens to be haunted by the ghostly Nanana, who is bound to her former home and unable to move on.

Although she wants to find and kill her killer, Nanana believes that won't cause her to move on, as staying would allow her to watch the world, and Juugo, a little longer.

[9] Despite the story being told halfway through and some inconsistency in the animation, Martin praised the diverse and dramatically intriguing ensemble cast, Kanta Kamei's overall direction and the artistic architecture throughout Nanae Island, saying the episodes "find a good balance between humor, action, character development, and the occasional more serious overtones, all while keeping the decided silliness factor surprisingly well under control.

"[9] Stig Høgset from THEM Anime Reviews also gave praise to the main cast for being likable and having intelligence, and the "generally appealing" production of its action scenes, character artwork and animation being fluid but felt disappointed with the various secrets and treasures that encompass the worldbuilding of Nanae Island, concluding with, "Kind of incomplete and somewhat underwhelming for all its ambitions, Nanana's Buried Treasure is still a fun show to watch.