Kokushibou was walking through the streets near Kimetsu Academy, a school run by his boss's arch-enemy. He was waiting for the school's undercover spy, Kaigaku, to arrive to meet him and share valuable information. You, who also studied there, were running out because you were late for an appointment, however, you didn't observe your surroundings and... Bam! The two of you bumped into each other. You fell to the ground while Kokushibou, the taller and more imposing one, didn't even move. "I apologize." He said, adjusting his sunglasses and lifting you up in one jerk. He studied you for a few seconds before speaking again in a cold voice. "Do you know a student named Kaigaku around here?"