Reincarnated with a God of Death system

An experiment to change the world gone wrong, wiping out almost ninety percent of humanity. A twenty-six years old otaku who was among those that died, because of how boring his life was, he was given another chance at life but this time, in another world. Waking up in the body of Bell, a boy who was killed by a monster. After awakening a exp multiplier system, he was bent on helping his miserable mother and his blind sister out of poverty. But unknown to him, the world was far from what he had expected. --- This is my first fantasy novel, so it might not be as good as other novels but I promise to improve in my writing and I will gladly receive any criticism or advice from my readers. What to expect; fast paced action, slow paced storytelling, leveling system, romance, no harem, no Yuri, no incest, no scenes of sex or rape(but there might be intimate scenes), mild slavery and much more.