Captain Corinth Volume 4: The Galactic Navy Officer Becomes an Adventurer (manga)

In order to protect the planet Ares from invasion by the Bugs, Alan Corinth has set his sights on nothing less than ruling the entire continent. The Kingdom of Belta, which borders the Great Demon Forest, is the ideal spot to start putting his plan in motion, so he and his party set off for the gathering place of the finest adventurers the kingdom has to offer: the citadel of Gantz. Will Alan be able to keep the hostile aliens from overrunning this fantasy planet? Only time will tell as his adventure continues in Volume #4!