|Location||Shinjuku Ward, Tokyo, Japan|
|Japanese Voice||Tokuyoshi Kawashima (川島 得愛)|
|English Voice||Josh Grelle|
- Kei Tajima seems to be Mishio's best, if not only, friend. He takes her abuse with good humor and follows her on her strange detective missions. This leads Mishio to call him 'Watson' (after Dr. John Watson, Sherlock Holmes' friend and biographer) since she calls herself 'Sherlock'.