MMORPG: Pierce Heaven Til' It Breaks - Chapter 81: Guild Created

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

Satou Shiki a Japan present-day university student suddenly one day he got attacked by a slasher when he open his eyes he was already transferred to another world’s labyrinth city. In that another world he who was awakened to do a lot of “things”.

competitive career in his sport, and his only solace is the daily training sessions with his coach, Sterling. At school, Winter keeps to himself, focusing on his studies while avoiding any unwanted attention. However, his life is turned upside down when a mysterious phenomenon engulfs the world.During class, an eerie black cloud blankets the sky, and a strange message appears in front of people around the world, announcing that humanity is about to face an apocalypse. Infected beings, known as 'The Stranded,' will rise—mutants, zombies, and other horrors with a single purpose: to eradicate mankind. At the same time, humans will undergo an awakening, gaining abilities based on their potential.As chaos erupts in his classroom, Winter witnesses classmates transforming into horrific monsters, and the world outside seems to fall apart. With survival instincts kicking in, Winter is forced to use his combat skills to defend himself and others, battling through his former classmates-turned-creatures. As he kills the 'walkers' and gains experience points from his victories, Winter realizes the stakes have changed—he must level up, survive, and adapt to a new, brutal world.But as Winter confronts the deadly new reality, he is faced with not only the horrors of a decimated world but the cold truth that his choices, abilities, and past will shape the fate of humanity.*******What's up, Author here. So I plan on releasing a chapter every 1-3 days as to not overwork myself, knowing that if I do, I might drop it the novel as a whole. So be patient with me.

This novel is also known as Only I Level Up

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as “Hunters”.

However, not all Hunters are powerful. My name is Sung Jin-Woo, an E-rank Hunter. I’m someone who has to risk his life in the lowliest of catacombs, the “World’s Weakest”.

Having no skills whatsoever to display, I barely earned the required money by fighting in low-leveled catacombs… at least until I found a hidden catacomb with the hardest difficulty within the D-rank catacombs!

In the end, as I was accepting death, I suddenly received a strange power, a quest log that only I could see, a secret to leveling up that only I know about! If I trained in accordance with my quests and hunted monsters, my level would rise.

Changing from the weakest Hunter to the strongest S-rank Hunter!

- Description from Novelupdates