Rakuenshima kara no Dasshutsu (Volume)

is the first volume of the Rakuenshima kara no Dasshutsu light novel series, written by Shinjiro Dobashi and Illustrated by Fuyuno Haruaki. It was released under the Dengeki Bunko Imprint in May 2012.

Synopsis
What is the "game" that unfolds in the tentative Garden of Eden?

The last summer vacation of high school life. 100 men and women gathered on an uninhabited island compete for escape from the island. Game name [Blitz] ──The key is the “value” of the pair with yourself !? And what is the meaning of the mysterious device given only to women──? Shun Okita, the main character who needs attention as a "strange person" from the "extreme game circle", quickly notices the essence of this game ... Shinjiro Dobashi presents a new non-stop "game" novel!

(source: Bookwalker JP - Translated)