An S-class Adventurer, Banished as the Tank of the Party, Uses His "Slave Release" Skill to Build the Strongest Country in History!

Story:

A brief description of the manga An S-class Adventurer, Banished as the Tank of the Party, Uses His "Slave Release" Skill to Build the Strongest Country in History!  Alex, a holy knight, is suddenly expelled from his adventurers' party. He tries to live a comfortable life by accepting a quest to cultivate a remote area, but suddenly he is given the extra skill "Slave Release"…? Summon beautiful girl slaves and cultivate a demon territory overrun with demons! A slow life of harem in a fantasy world is about to begin!