Age: 31

Shinichi's substitute math teacher. She is infected with a parasite.

It is later revealed that she is pregnant with a human baby. At first, she plans on experimenting with the child to further extend her knowledge of humans. Although, she develops emotions—love, even—for her child as the story progresses, and protects the child until her last dying breath. She voluntarily gives her child to Shinichi after realizing what it means to be a mother and have human emotions. She then dies as a result of multiple gunshots from Hirama and the other investigators, although she would have survived if she had fled or protected herself.