One day, on his way home, a man falls into a manhole. He wakes up in an unfamiliar room and is informed of his death by a voice claiming to be the "Inter-World System." He is then told, "The hole you fell into leads to a lower world." It's explained that some of the geniuses and prodigies who appear in this world are, like him, individuals who fell from a higher world. Given the opportunity to reincarnate into a lower world, the man is asked what kind of world and environment he desires. What was the man's answer?

※ The protagonist of this novel is no saint, nor does he consider himself a champion of justice. He will use any means necessary to win, and he never backs down from a fight. He prioritizes his companions above others and dislikes troublesome things. This is the story of such a man — a bit cunning.

Volumes 1-5 now available.

The main story has been moved to AlphaPolis.

http://www.alphapolis.co.jp/content/cover/465069163/

Side stories are available on Narou.

The Rise of a Certain Demon (Serialized)

http://ncode.syosetu.com/n2422di/

Isekai Reincarnation Cheat Manual (Serialized)

http://ncode.syosetu.com/n3490dy/

The Hero's Redo ~ The Hero Who Saved the World Reincarnates as a Beautiful Girl (Serialized)

https://ncode.syosetu.com/n1672eu/