「Stop leaving the hidden boss alone, oblivious to its presence!」

As an obsessive gamer, I was reincarnated into another world immediately after defeating the final boss of a game I had played extensively.

The other world I was reincarnated into was the very same game world I had just been playing. And what's more, I had been reincarnated as the game's strongest hidden boss, the Demon God.

In order to fulfill the hidden boss's main quest, I ceaselessly wait for the 'Protagonist' in the hidden dungeon.

However, no matter how long I wait, the Protagonist doesn't appear.

This game is notorious as one of the most brutal 'death games'.

Will the Protagonist ever be able to reach me!?

Or... am I just being ignored, completely unaware of my existence as a hidden boss!?

This is a story about the strongest hidden boss, hiding his true identity, and training the Protagonist.

And a story where a mere saintess NPC who handles saves becomes the protagonist, a villainess noble daughter falls for me... and I, the Demon God, end up building a harem.

※This novel is also posted on Kakuyomu.