When a highly ranked monster hunter finds himself fighting a foe that none has defeated before he quickly realizes why, and after a crushing and life-threatening defeat he finds himself in a new world, one where there are no 'Monsters' as such and any creatures bearing any semblance of the title have gone extinct.

But when monsters from his own world start pouring into the world he was dragged into, he quickly finds that he is the only one that has the skills and knowledge to defeat them, armed with an an arsenal of weapons and a group of friends, he will set out to find out what is allowing these monsters access to this new world, and most importantly...

Why?

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Teen rating because of minor swearing and slight amounts of blood and guts