The Arrival of Final Fantasy

After waking up, I found that the whole world had changed, and humans had disappeared for thousands of years. Now this continent is ruled by a group of magical orcs. As the only human being still alive in the world, I must live carefully. In order to find his own memory, he disguised himself as an orc and began to learn magic and study history. In order to find the reason for the disappearance of human beings, I began to learn the skills of exploring ruins. While deciphering ruins one after another, I slowly began to feel something was wrong...