[A rewrite of a previous series: Rebirth: Hero!] 

Description:

As he grows, the world trembles; as he speaks, the world listens; what he wills, the world provides; common sense overturned by his power. 

A man is reborn from a previous life into a human, the weakest race on the planet. Along with him, a girl whom he saved in his last moments.

With the memories of Kai’s past and present life, can he conquer everything and truly be a Monarch?

Together with the residents of the new world, watch as they pierce through the boundaries and break through the chains of fate!

[Updated description]

Summary:

Kai dies trying to save a girl and is reborn as a human in another world, the being who reincarnated him and the girl he saved gave him the task of becoming a monarch which he made his goal along with meeting the girl he saved once more.