Nanana's Buried Treasure

Ryūgajō Nanana no Maizōkin (龍ヶ嬢七々々の埋蔵金) is a Japanese light novel series, written by Kazuma Ōtorino with art by Akaringo. As of December 2013, 5 volumes have been published by Enterbrain under their Famitsu Bunko label. A manga adaptation by Hitoshi Okuda began serialization in Enterbrain's Famitsu magazine in January 2012. An anime television series adaptation by A-1 Pictures is scheduled to air from April 2014 on Fuji TV's noitaminA block. Before the first light novel volume was published in January 2012, A-1 Pictures animated a promotional video that was streamed by Enterbrain on December 26, 2011, after the novel won the top prize at the 13th Enterbrain Entertainment Awards in September 2011.

Plot
Nanana who was a ghost once a beautiful but NEET (Not in Education, Employment or Training) girl. A boy named Juugo was disowned by his father and forced to transfer to a high school on the "Special Student Zone," an artificial island. With only 40,000 yen a month to live on, Juugo chooses a low-rent apartment that happens to be haunted by Nanana. Juugo and members of the school's adventure club join a "treasure hunt royale" on the island for the Nanana Collection, a treasure that possesses a mysterious power.

Official

 * http://nanana.tv/