A mirror appeared in the sky, reflecting everything in the world. Except for inanimate objects, everything else became monsters.

However, only William Carter could obtain these monsters.

Because...

He is the only administrator of the Mirror Bureau.

Official Version:

When you gaze into the mirror, the mirror is also gazing at you.

William Carter looked up. The mirror in the sky was like an abyss, and his reflection inside was slowly climbing upward.