Rakuin no Monshou V Soshite Ryu wa Kouya ni Oritatsu

is the fifth volume of the Rakuin no Monshou light novel series, written by Tomonori Sugihara and Illustrated by 3. It was released under the Dengeki Bunko Imprint in March 2010.

Synopsis
Orba became a mercenary of Tauria, disguised as the death of Crown Prince Gil, who had been replaced, and disappeared from the front stage. The entire area of Tauran was swayed by the threat of the mage Garda. The next target is the city-state Helio. However, it also had many internal worries, such as rebellion and the transformation of the bewitching Queen Mareline. Orba goes to the Helio as a reinforcement. After fulfilling his revenge, he will fight as a mercenary without a definite purpose, but his fate drives Orba to a new challenge!

(source: Bookwalker JP - Translated)