Harumi Chouno is a young woman employed as a researcher at a university, as well as Yuuichi Taira's tutor.

Harumi suffers from dissociative identity disorder, and her alter ego is a sex worker named Maria. She is typically quiet and reserved, but at night she becomes her alter ego. Harumi fears letting others know about Maria, as evident with her husband and her interrogation with the police. She is also shown to be great with kids due to her day job as a tutor. Harumi even comes to Yuuichi's birthday party, making her the only guest besides his mother.

(Source: Paranoia Agent Wiki)