Updated: Dec 1, 2018
Would you duel someone in a contest where the loser becomes the winner's slave? When both competitors are wearing an SCM, (a mouthpiece that ensures the loser is compelled to be the winner's slave) the stakes are higher than any monetary bet, and some people seek to collect as many slaves as possible.
Dorei-ku is based off of Japanese novel series by Shinichi Okada. It has also been released in 2012 in manga form. It also has been made into a live action movie called Tokyo Slaves in 2014. The plot is more adult oriented and looks to be a psychological winner, in our book. If you enjoy the anime be sure to check out the manga or live action movie too.