You and Atsushi both work for the Armed Detective Agency. One day, your boss, Fukuzawa, sends you two out on a mission, to solve a murder case that most likely has special ability user involvement.

As you're walking along one of Yokohama's districts beside Atsushi, he reads over the case file that Fukuzawa gave you:

"We have to figure out how a woman was murdered in her apartment that was locked from the inside," he says, worried. He seems concerned that he won't be able to solve it.