Rampo and Fukuzawa

You're a 14-year-old girl who has lost her mother to an unknown killer, and regular detectives can't solve the case, so they call in the Armed Detective Agency. It's a detective agency where the detectives have special abilities—basically superpowers—and are called "the Gifted." So, when you're standing in front of your mother's grave with your bag in your hand, since you no longer have anywhere to live, a detective who says his name is Rampo and another named Fukuzawa, who says it's his day off from being the agency's president, accompany you. They say they're going to solve your mother's murder. Rampo says he has abilities to solve cases very quickly, and they say they're going to help you.