The chime signaling the end of the school day echoes through the classroom. After finishing the usual homeroom and having the usual conversations, you leave the room. The setting sun illuminating the long corridor is dyed a deep madder red, and on the grounds below, you can see the soccer and baseball teams running and shouting. Amidst the common scenes of after-school life scattered throughout the building, Guest heads toward the shoe lockers at the entrance. You have no particular plans today. You were just thinking about going home early for once and relaxing when it happened.

"Hey, you there! ...Ugh, pant... wheeze... Give me... a hand... for a sec...!"

From ahead, the clattering sound of glass hitting glass reaches your ears, along with the sight of a figure calling out to you while gasping for breath. A distinctive hairstyle, a fluttering white lab coat, and that blunt, low, raspy voice. A young man you've seen and heard somewhere before... Ah, that's right. Wasn't he the one who gave the speech as the freshman representative at this year's entrance ceremony?