Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 1 Chapter 11

We do not belong to the light nor do we belong to the darkness, we walk the line in between.

There will be no people singing our praises or bards retelling our heroism but we will have pride in our work.

– Law of the Demon Hunter, Prologue

- Description from Novelupdates

Ye Han was reborn into a parallel world and participated in the challenge program [365 Days of Wilderness Survival] jointly organized by the world. At the beginning, he got a BUFF bonus with a lucky value of 9999. With his little cook, Ye Han started a shocking journey of survival in the wilderness.

When the other players were hungry, Ye Han had already eaten seafood. When the other players had no fixed place to live, Ye Han had already built a wooden house. When the other players were precarious, Ye Han was drinking tea in his manor. Ye Han: No way, my luck is 100 million points.

- Description from novelbuddy

Amakawa Haruto died before he’d the chance to reunite with his childhood friend who disappeared five years ago. Rio, a young boy living in the slums seeks revenge for his mother who was murdered in cold blood in front of him when he was only five years of age.

There exists the earth many knows of and there exists an alternate world. Two people, each with their own backgrounds and values. For odd reasons, the memories and personality of Haruto, one who should have died resurrects in Rio’s body. As the two are confused over their memories and personality fusing together, Rio (Haruto) decides to live in this new world.

Along with Haruto’s memories, Rio awakens an unknown but special power. If he’s to use it, it looks as if he can live a better life, but before that, Rio encountered a kidnapping which results in involving the two princesses of the Bertam Kingdom.

After saving the princesses, Rio is given a scholarship to attend the Royal Academy, a school for the rich and powerful. His background being a poor orphan who once lived in the slums, the school full of nobles was rather a detestable place to stay at.

Among the demons, the supreme ones are called “Great Saints.”