|First Appearance:||File 1: Mystery Case at the love hotel-Chu!|
|Number of Episode|
File 1: Mystery Case at the love hotel-Chu!
After their lessons were over, Tashima and Tomonaga came to their office greeting everyone there. She immediately sat beside Kitagawa to check on their PC. When Kojima arrived with a murder case in a love hotel, Tashima collected the statements of the guests that were staying next to the victims' room. The guests mentioned that around 30 minutes before the estimated time of death, that they heard the sound from the TV Program Shoten coming from the victims' room. When checked if there were other possible suspects with motives to kill the victims, Tashima found none. When Tomonaga found it odd that the couple was away from each other, Nishino reluctantly told everyone that she found out that the female victim was to be a beneficiary of a large insurance claim registered to the male victim. From there, they pieced together the evidence pointing to the female victim as the culprit and investigated on her motive.