The story starts as a typical reincarnation story. But not so typical is that he is reincarnated as a goblin. So the early story is how he train himself and his friends, how he uses his superior intelligence to fight superior enemies, and discover new skills. And then he become the leader of his people, and start building an army of mercenary. Now I don't have any problem with that, but I do have problem is rooting for a bad guy. Scratch that, EVIL guy. He would eat anything weaker than him (including humans of course) would imprison any female enemie (he eats all the male of course) and start drugging them before raping them. And minds you, he doesn't just attack his enemy, even if the opponent is not hostile, he would still attack them, because he want to eat them, or rape them.