Third life

Jade, now in his third life, has inherited his heritage from his past lives—the first being an ordinary human who loved reading and worked as an assistant sales manager, dying a few weeks in after creatures came and invaded his planet and the second being a human who, in a planet with harsher environments, grew to become a valiant warrior, serving his kingdom till the same creatures invaded and ended that world.

Now, in a new world with even friendlier environments than his original—another "earth"—what will he do when he returns to society with the memories from his past lives? Will the creatures who destroyed his old homes and ended two of his lives come back and haunt him once more?

*I'm sure they will start to invade at some point...