Within a Hollow Heart - Chapter 25: Volume 1, : "The Price of Power"

prev name: In mha with jjk power.---------[mha synopsis]“Hero? Villian? It is all redundant.”“There is no such thing as good or bad, only interest is what matters.”Kurokai Sento said as he faced the inheritors of One For All and All For One standing against him with their fellow Heros and Villains.“Why? Why?! Just what is your motive?! Kurokai!”Kurokai smiled and replied calmly.“Motive? Of course, there is, unfortunately, none of you can understand.”--------------------------------It is a multiverse travel type of fanfic. The first world will, of course, be MHA(complete). Then Overlord(Ongoing), danmachi(ongoing)You can directly start reading from Overlord if you want, it won't affect the flow.---------------[Overlord synopsis]Lioro blankly looked at the game like screen in front of him.It seems he has traversed to Overlord world with a Yggdrasil like game template![Ding! Congratulations on getting the special profession 'Dimensional Traveler']“......”Can it take me home?

In a monstrous post-apocalyptic setting, this is a story of how a lowly Inventor, Lance, conquered a nation governed by immoral group of Scientists called The Corporation. He grew and climbed up to the highest rank possible as a Scientist with his inventions and side businesses. Eventually, he became a weapons inventor, building weapons to two opposing sides. In doing so, Lance always crossed a dilemma. How could a nobody topple the most powerful government? How could one overcome circumstances beyond his grasp, especially in a world filled with monstrous mutations called the Abominants?

A data loving young man from Earth has an accident which transports him to a dark land filled with terrifying creatures and magical powers. Fortunately for him, he has a Biological Assistance Chip to ease his path. However, things in this bizarre and strange world are not always as they seem, and, though it is a tremendous asset, the chip doesn’t always work as expected. With all of the crazy creatures and magical mayhem around him, one can only wonder what the future holds for this young man…

- Description from novelupdates

Hao Yan Che is an immortal and Yuan Gun Gun is a mortal.