Uragirareta S-Rank Boukensha no Ore wa, Ai suru Dorei no Kanojora to Tomo ni Dorei dake no Harem Guild wo Tsukuru

Story:

Egil, an S-rank adventurer who has lived hateful of a "slave," falls in love with one slave at a slave auction he was forced to bring. She was Eleanor, the former third princess of the Kingdom of Cornelia. Eleanor, a slave to Egil, begs Egil to "kill my childhood friend who sold me to a slave trader!" Keep an eye on the estrus slaves if there is a chance! Can Egil rescue the body and mind of beautiful girl slaves and bring peace to this world…!