Kami Gokuto- Mary Skelter: Kou no Arika

is the light novel adaptation based on the video game series: Mary Skelter. It was written by Otono Shihouji and Illustrated by Kei Nanameda. It was released under the Dengeki Bunko Imprint in October 2016.

Synopsis
Another story drawn on the same stage and time axis as the super-topic game "Mary Skelter: Nightmares". Draw a thrilling jailbreak drama of Mamoru and Light born in an underground prison!

(source: Dengeki Bunko Official Website - Translated)