The protagonist isn't from this world. His own world had already met its end. He was not only its foremost powerhouse, but also its guardian. Yet because he wasn't strong enough, he failed to protect it, and it was destroyed. The people could only huddle together and survive in the secret realm they had discovered. So he left the secret realm to search for a new place where they could live. For countless years, he drifted and wandered, slaughtering magical beasts from other worlds. During his long wanderings, he was swept into a vortex of space and time. When he woke again...
