Financial Emperor: After I Rose From the Dead - Chapter 25: Climax [R18]

Jaxon Hawk pretty much lives inside, loving his own space, when BAM! He gets this crazy thing called the Sniper System just as the world goes totally bonkers with zombies. But these aren't your grandma's zombies, shuffling around and moaning. Nope, these guys are like Olympic athletes, running, jumping, climbing, basically doing everything to get you. And get this, they keep getting stronger and tougher each time they change! Every time you meet one, it's a fight for your life.The human race is on its last legs. The good thing is, everyone knows they have to work together or they're totally done for. This isn't a story about fighting other people, it's about not becoming zombie food. Regular folks don't have a shot, and even soldiers are sweating bullets. This is a hardcore survival story, where Jaxon has to use his new skills and think smart to keep himself, his family, and his new friends safe.It's a wild ride of thrills, trying to stay alive, and finding people he actually cares about. Oh, and there are some girls, too, making things even more interesting. It's all about big feelings, scary moments, and doing whatever it takes when every second could be your last.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Kyoukai Senjou no Horizon chronicles the story of a futuristic civilization returned to Earth after constant warfare hindered them from traveling beyond the post-Apocalyptic Earth. At this stage, a small archipelago called the Divine States were the only hospitable land on Earth. In order to regain the space-faring technology they had lost after many years of war, they decided to recreate history with a book called the Testament as a guide.

It is the year 1648 in the Testament Era. Toori Aoi, Chancellor and Student Council President of the only academy on the airborne city-ship Musashi, faces the ten-year anniversary of the death of his childhood friend Horizon Ariadust in an accident. As he prepares to celebrate the occasion by proposing to P-01s (an automaton who looks exactly like Horizon) he discovers that his suspicion about P-01s’ appearance actually has a basis in truth; P-01s is in fact Horizon Ariadust, reborn into a robotic body. In addition to this, Horizon’s emotions had been stripped away and are now stored in eight powerful weapons called the Mortal Sin Armaments; which are now in the possession of key people in various established countries in the Divine States.

To retrieve the emotions of Horizon Ariadust, Toori Aoi along with his friends and allies begins a crusade against different obstacles as key events in history are recreated in a futuristic manner.