Necromancer's Otherworld Journey (A Isekai Progression LitRPG)

The day of Apocalypse appeared on earth. Numerous gates opened and through them appeared the humanity's worst enemy, the 'Devils'. They ravaged humanity mercilessly but miraculously, the humans also gained something. They awakened. The power to repel the devils was now with them, but things don't go as one wish. The greed of humans and the destruction by devils gave birth to their worst possible enemy, a necromancer, the incarnation of death. The necromancer, till the last place on earth killed everybody before finally killing the last human. [You can now leave the body of death.] "Finally!!" Rejoiced, he accepted his fate, but- "What? I am in other world? And why the awakened of earth are here? And why do i have this sun symbol on my hand?" Landed in other world, our protagonist paves his way through this world, trying to uncover the secrets both the world contains and finally realizes his role in this. This is my second time writing a novel. The first one was not so good.  This one is something is prepared carefully. To Everyone, english is not my native language yet I will try to correct most grammatical error. But still if you find any, please mention them in the comment. This story is for those who- 1. Like a serious plot with little comedic interaction along with system interactions. This story will have system interaction and will have a slow pace with serious tone. 2. Like little slice of life contents. There will be some slice of life moments. 3. Dislike harem and want a MC with little to no romance. This story as of right now doesn't have any female lead. I can't think of any female lead who can be with our MC. Please enjoy and if possible, do rate and leave a review. Release schedule - Monday, Wednesday and Friday.