Japan. She lived in Britain for three years. Shukichi Haneda Voiced by: Toshiyuki Morikawa is a professional shogi player, as well as the former boyfriend of Yumi Miyamoto. He is widely known by the name of in the world of shogi. Yumi nicknames him because he keeps eating cheese like a mouse which makes a noise that sounds a lot like 'Chu'. He is also the middle brother of the Akai family, making him the sibling of Shuichi Akai and Masumi Sera. Mary Sera Voiced by (English): Kira Buckland Voiced by (Japanese): Atsuko Tanaka is a middle-schooler with light hair who has been hiding in various hotels in Tokyo with Masumi Sera. Despite her appearance, she is a middle-aged woman and the mother of Shuichi Akai, Shukichi Haneda and Masumi Sera. She is an MI6 agent. During the timeline of Holmes' Revelation, Vermouth fed Mary something like APTX 4869, which caused her body to shrink from that of a middle-aged woman to that of a middle-school child, on the Vauxhall Bridge. Vermouth also implied that Elena Miyano is the younger sister of Mary after feeding Mary the drug. Her eyes have a remarkable resemblance to those of Shuichi Akai and Masumi Sera. Momiji Ooka Voiced by (English): Faye Mata Voiced by (Japanese): Satsuki Yukino is a second-year student from Kyoto Senshin High School and a champion of Hyakunin Isshu karuta. She lives in the Higashiyama district of Kyoto. Her family is likely wealthy since she has a personal butler, third to Renya Karasuma and Suzuki plutocrats. Momiji claims Heiji "proposed her when they were little" and thus believes that they will be romantically involved in the future. Rumi Wakasa Voiced by: Fumi Hirano is the new Deputy Homeroom Teacher at Teitan Elementary school for Year 1 Class B. Her personality seems to be that of a clumsy and incapable teacher. She approached the Detective Boys because she was scared of the old warehouse at the school and needed them to come with her. However, once she was out of sight of the Detective Boys, her personality changed dramatically to that of a skilled fighter with a scary face. Her right eye suffers from amaurosis fugax. Most likely, her name is meant to resemble "ASAKA RUM", the code from Kohji Haneda's death, with the addition of a W and an I. She was one of the three suspects of Rum. Azusa