COTE : There is Something Wrong With Hikigaya - Chapter 23 - : School Caste

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates

[Can the devil’s music bring happiness to the world?]From Jimmy Hendrix to Rachmaninoff, all the historical musicians who he meets in his dreams.The devil that presents itself as a little boy in love with singing.The devil’s blessing, given to such a tiny child.In the blessings of many devils,The boy’s song for the world begins.

Because of an accident, Chen Fan obtained the power to possess an electric eel!

[Character Deleted.]I deleted the character I had been raising for over 5 years.To finally defeat the final boss of Demon Fantasy—the one I could never quite beat.For the sake of defeating ‘Baal’.“…I can just start over. I can do it.”And then…[Special reward has been granted!]“What? A mythic-tier trait?”The perfect opportunity had arrived.“This time, for sure!”I’ll raise the strongest mage and take down Baal!At least, that’s what I thought when—[Welcome to Demon Fantasy.]I found myself inside a world teeming with 666 kinds of demons.And I had the ‘special reward’ I just received!“…Fine. Let’s see who wins this.”I was confident.After all, I’ve been a veteran of this game for 10 years.