MTL - Repairer - Chapter 486 walk at night

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

One sunny day, Shen Jingwei, a Z-list actor, received an opportunity to attend an open-call audition the very next day.It was for the role of an antagonist in a new BL C-Drama, “Dance Of The Dragons”, which was adapted from a novel of the same title.He agreed to join the audition due to several factors, among which his manager's threat to jump off the 20th floor, his dire need for money, and also the fact that his rank in the film industry could not go any lower.One look at the panel of judges made him want to turn on his heel to leave, but it was all too late.Because who would expect the poor Z-List actor to meet his mortal enemy/ex-boyfriend, Yan Renzhong, the A-List Actor responsible for his decline long before he even learned how to fly?------------------“You and I... are playing a couple of lovers, who will go on to get married and have children with each other.”Shen Jingwei could sense blood coming up his throat.What was the point of saying it out loud, again?“Yes,” he forced himself to agree nonetheless.Yan Renzhong pinned him with a stare.“We have unresolved issues from the past. I hope you won't let them affect your and my performance in the drama. Act the professional you are supposed to be.”“...”“And don't call me 'Emperor Yan' anymore.”Yan Renzhong left after delivering one blow after another, not even waiting to see if Shen Jingwei succumbed to his injuries or not.What?Whattt?Whattttttttt?

Ryo Tanaka, a struggling college student, works tirelessly at multiple part-time jobs to make ends meet. In a bid to earn some extra cash, he volunteers for a paid drug research study, unaware that it will alter the course of his life forever.The experiment takes a disastrous turn, leaving Ryo bedridden with a high fever for several days. But when he finally awakens, he finds himself in a world plunged into chaos. A deadly virus has ravaged the city, turning its inhabitants into ravenous, flesh-eating zombies. Streets once bustling with life now lay desolate, the remnants of civilization crumbling under the weight of the apocalypse.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.