In an imperial research facility, a calamity-class enhanced monster awakens after 200 years. Inside it is the soul of the former soldier Eunos. In despair by his own monstrous appearance, he thinks "At this rate, they’ll just try to kill me!", and resolves to find a way to coexist with humans. Wasting no time, he uses his incredible physical abilities of enhanced vision and invisibility to defeat vicious monsters and save humans! But as he can only growl, he ends up a target of the military! (Source: Manga Mirai)

The protagonist is an ordinary soldier from an empire at war who gets used as a guinea pig for genetic engineering experiments, turned into a monster and put into cryosleep. 200 years later he wakes up in a sword and sorcery world. The empire is gone and he has to survive alone in the body of a monster whom everybody wants to kill on sight. Meanwhile he encounters various pretty ladies (and elves) in need of rescue.