[Dropped. The second book's numbers were too poor.]
Nain, the Chief Knight of the Holy See, perished alongside the Demon Queen in a war fought for humanity.
He thought the Demon War would end in humanity's victory and bring peace.
But after the war, relations between the allied nations gradually grew tense!
Just as the situation in the world grew more and more fraught,
Nain, the Chief Knight who should have been dead, quietly came back to life!
The world's conflicts and his own death should no longer have anything to do with him. He should have been able to live in peace after dying.
But to his surprise, old acquaintances continued to pester him even after death!
A mad genius doctor, a serious female knight, a catgirl with two sides, and dark elf twins.
One after another, they gathered, eventually forming a force that would decide the world's fate!