In Yokoku Satsujin, the 2019 TV Asahi Japanese adaptation of A Murder is Announced, Harukawa Mana (春川真名 - Mana Harukawa) is a waitress at the Royal East Hotel. She is the direct parallel of Myrna Harris from the original novel.
Mana is the girlfriend of Kurumai Kyuzo (Rudi Scherz) and has roughly the same role in this adaptation, except that Kurumai appears to have told her much more. Mana tells the police that she doesn't really consider Kurumai as her boyfriend as he was much older than her. He was perhaps a kind of "papa friend" (kind of sugar daddy). He claimed to be from a wealthy Hokkaido family and he gave her expensive gifts. As for the practical joke at Komichi-no-yakata (Little Hall - "Little Paddocks"), Kurumai had told her that he had to stage an amed robbery hold up. She had chided him that he can't really do it because he had no gun but he had told her he didn't need a gun. Everything will be pitch dark and all he needed to do was use his fuges to form the shape of a gun. One other thing which Kurumai had told Mana was that he knew the mistress of Komichi-no-yakata from times past.
The part of "Mana" is played by Nakayama Kokoro (中山こころ).