I had an anime recommended to me. The MC sells two people into slavery in the second episode.
(hexbear.net)
The world's most notorious "talker" runs the world's greatest clan
Should've known from the light novel ass title 
The original isekai anime, Aura Battler Dunbine, is good. It's kinda cheating, though, since it's by Gundam creator Yoshiyuki Tomino and is based on some of his novels