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Blood type: A Rei is a mysterious girl who is found alongside Zen within the alternate Yasogami High School. She shows a particular interest in anything she can eat and conversations involving her frequently turn towards food as she mishears much of what they say, interpreting it to similar-sounding edibles. Rei was originally a girl named Niko, who died from a terminal illness and was brought to Chronos in order to be guided towards the afterlife. Niko had fallen into such a deep despair that she could not even scream or cry. Chronos became interested in Niko, and decided to try to get her to react by creating a false Yasogami High born from her memories. However, this idea backfired as Niko suddenly began to talk about how she dreamt about going to Yasogami High during her operation, and hated how everyone was able to enjoy living while she was left to die alone despite working hard. Crying for Chronos to kill her, Niko began to try and gouge her own eyes out. Filled with remorse, Chronos suddenly shielded her eyes and took away her memories, leaving her without any idea of who she was or why she was in the False Yasogami High. Chronos was then named Zen by the memory-less Niko, who said he was a good person. Zen then gave Niko the name Philei, but she changed the name to Rei instead, since Philei was too difficult to pronounce. Zen then sealed away his own memories and hid them away along with Niko's things inside large chests, which eventually produced the labyrinths. Zen then wanted to help Rei find the meaning for her existence, and planned to tell her the truth when she was ready.