Elfriede the Exterminator (Volume)

is the first volume of the Elfriede the Exterminator light novel series, written by Akaneya Matsuri and Illustrated by Mamuru. It was released under the Dengeki Bunko Imprint in December 2013.

Synopsis
Dengeki Novel Grand Prize "Grand Prize" Winner, Akaneya Festival presents youth school battle story!

Due to a catastrophe called the Sea Crater Incident, the area including the metropolitan area suddenly became the "sea" one day. Minsuke Yoshioka, a second-year high school student who attends a warship school floating in the sea created by this disaster, will participate in the naval battle tournament and burial selection battle held at the school with his classmate Elfriede. ―.

(source: Bookwalker JP - Translated)