Deemed a failure by the Goddess, I was reincarnated into the world of a certain game, famous for its notoriously difficult final boss, the Demon Lord.

My skill is Dungeon Master. My race is demon. Clearly, I'm not on the protagonist's side, but the enemy's...

While I was at my wit's end, I encountered a being clearly superior to me, but... Are you the Demon Lord...?

You've defeated the heroes, but lost your subordinates and your dungeon, and now you have no motivation...?

I seem to have a useful skill, so won't you let me serve you as a tool?

*This work is also posted on Kakuyomu.