Kai Yume (かい夢, Yume Kai, literally meaning Mysterious Dream), often referred to as Fake Kei and/or The One with Kei's Face, better known by his moniker of Weaver of Nightmares was a spiritual being of unknown origin that surprisingly had the same facial and bodily features of Kei Yume, the renowned Captain of the Third Division. During Kei's apparent disappearance into the various dimensions, Kai suddenly appeared, assumed the Captain's identity and took command. Initially meeting Kei's duties with fervor, he played the role of Kei extraordinary well and fully convinced himself and everyone else that he was the real deal. However, this didn't last for long. As time passed and there was no sign of Kei returning, Kai turned and showed his true colors, revealing a malicious and devious person