Monster Siege Survival: From a Mauser to an Invincible Mech

[Apocalypse]+ [Global Survival]+ [Evolution and Synthesis]+ [Mecha]+ [Modern Firearms]+ [No Female Lead]

Seven billion people around the world are transported to a world where monsters lay siege to cities. They can only survive by defending their own city.

Each player can choose a different path of development.

[Mecha] [Mercenary] [Modern Firearms] [Turrets] [Beast Companions] [Invincibility]

(Highlights: The story features thousands of monsters from various planes, from goblins, Murloc amphibious fish-men, Hill Giants, and chimeras to Lickers, Venom, Frost Bone Dragons, and Kaiju. My new account doesn't have a high enough level yet. I'll add an illustrated bestiary once my author level reaches Lv. 4.)