The apocalypse is coming, and roommates offer sacrifices to heaven.

When the fog falls, the Book of Blood Spirit appears in the hands of all survivors, and only the contracted monsters can survive.

Su Han turned his attention to the mutated and twisted roommate next door, and silently took out a shiny fruit knife...

The ferocious flesh corpse, the giant spider with cracks, the eyeball covering the city, the palm monster with one eye and sharp teeth...

Civilization has fallen, cities are broken, and all humans have become meat in the mouths of monsters. If you want to survive, there is only one way:

Use monsters against monsters

Luo Yi, a high school dropout in his original world, was isekai’d into the world of the Witcher 3. Starting out as a weak boy named Roy in the village of Kaer, Lower Posada, he was determined to grow stronger, no matter what it took. The first step toward becoming a legend was to kill. And his first kill was… a rooster. ‘You gain 1 EXP.’ Of course, Roy had his own cheat system like all the other isekai protagonists. His first step to becoming a legend started now…

These days, being a monster is tough. You get beaten up by Ultraman, magical girls, Kamen Rider, angels, demons, and even ordinary people! Xiang Xianyu just wants to say, "Wait until I gather seven idiots, then I'll show you what true cruelty is!" Then… Xiang Xianyu turns gray and squats in the corner: "This is too hard!!!"

[Natural disaster + mass production of troops + no female lead + decisive killing + four races of heroes + savior] As usual, young Fang Yun finished a game of Warcraft III, and the water cup next to him inexplicably spilled on the keyboard. A burst of lightning illuminated the dormitory, and Fang Yun regained consciousness.

"It's over! Five hundred worlds!"

It turns out that Fang Yun has arrived in the Warhammer 40k era.

So Tzeentch! Khorne! Nurgle! Slaanesh! And that false emperor sitting high on a golden toilet!

Let the Scourge send you on your way!!!

I've been transported to another world! My birthplace is a rice paddy, and there's a giant figure floating in mid-air with glowing eyes right in front of me. What's going on? I'm in a real hurry, waiting for some kind of cheat code online—Gero Kent, who just transmigrated.

This book will feature:

'Don't run, charge towards Ultraman's Flying Kick!'

'Titan will only waste my youth'

'Ultraman, do you really love this world that much?'

'Do what you believe is right.'

It's a crossover anime/manga series, not featuring a single female protagonist. It's similar to Ultraman and includes content related to Your Name, Kaguya-sama: Love Is War, Lonely Rock, Oregairu, and more.

Zuo Zigong traveled through time.

Liben has traveled to a parallel universe.

He transmigrated into the body of a handsome Chinese man studying in Tokyo.

In this special parallel universe, there is Shuchiin High School, Sobu High School, Itomori Town, Shinomiya Foundation, the End Band, and many, many other things that once only appeared in anime.

This seems like a good start?

However, at the same time, Zuo Nong also received a legacy from an extremely ancient civilization.

From this legacy, Zuo Zigong learned...

The world-destroying monsters are about to arrive one by one, and he will need to transform into the final giant to fight them.