Dorei Yuugi Didi

The clash of the strongest vs. the strongest slaves, the future when the bell rang for an invitation to a further hell—Roku, a young man who leads a boring life, is challenged to a little game by Ebe, a millionaire he met at his part-time job. Unaware that this has opened a door to a disgusting world of corruption... a new slave game heads towards another dimension! Play with people, with life, with everything in the world filled with depravity!