Айко Маэбара

Кэйити's mother. She first appears in the "Chapter of the Demon Kidnapping" together with her husband. In the "Chapter of the Deadly Curse", it is revealed that Aiko is very fond of detective novels and reads any books of this genre. She also wrote a detective novel and won one of the literary competitions. It was Aiko who told Keitaro the murder plan, which he later used against Hojo.