Nanana's Buried Treasure (龍ヶ嬢七々々の埋蔵金) is a Japanese light novel series by Kazuma Ōtorino, with illustrations by Akaringo and Non. Enterbrain has published twelve volumes since January 2012 under their Famitsu Bunko imprint. 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) is also published under Famitsu Bunko, with the first volume released on August 30, 2013. 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.
In July 2014 Nozomi Ōsaka, under penname Non, replaces Akaringo as illustrator for the original light novel and its spin-off due to Akaringo's health condition. Akaringo stated that his health declined, and which is why the illustration for seventh volume could not be finished. Due to this, the decision was made to replace the illustrator in both projects.[1]
Plot
On the "Special Student Zone" artificial island Nanaejima, the story centers on a beautiful, optimistic, but