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Due to an unexpected viral infection, a living person suddenly turned into a biting monster. Humanity is in panic, and some people are taking advantage of the chaos to seek their own interests. Where there is evil, there is justice. When morality has lost its shackles, the only thing we can do is to pick up the weapons in our hands to defend the last holy place in our hearts! See how the iron-blooded mercenaries show their power in this troubled world~!

Alien space cracks appeared in the moon's orbit without warning, and a strange red light swept across the earth... This is where mankind's nightmare begins...

Please note that the background world of this article is a parallel world and does not involve any real-world situations. Any similarities are purely coincidental! The unlucky boy encounters a sinister system. In name he is the host and the system, but in fact he is the slave and the slave owner. All efforts are for one goal: "Make the world a little greener."