Appears in "Animal Magnetism Theory" and "Lovesick Rappart."

Kototoi is a classmate of both Kuramae and Kiyosubashi. She used to go out with Kuramae and initially kept their relationship a secret.

Kiyosubashi later revealed that Kototoi was a practitioner of hypnosis and that Kuramae was only hypnotized. They broke up because of this but they remained good friends.
In "Lovesick Rappart," she became a well-known hypnotist, and Azuma asked for her help to forget someone who broke her heart.

Despite Azuma's repeated heartbreaks and requests for help, she never once told her of the loop because she was hoping that Azuma can cause a change and that she might have a chance. She hasn't gave up on Kuramae yet and admits to be in a one-sided love with him. She took opportunity of Kiyosubashi's absence to hang out with Kuramae.

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