An original series, David Production's Onmyo Kaiten Re:Birth Verse is messy and frustrating. Besides its isekai aspect, the ...

Some of the more popular fantasy anime have MCs who start weak but get OP later on through either a plot twist or sheer will and hard work.

In these isekai stories, the main character is reincarnated as a child -- and is usually overpowered in the new world where they find themselves.