Premise
The Straight-laced Big Brother and the Wild Big Brother
Worldview: A modern Japanese city where chemistry has advanced.
Introduction
Narrator: Nagumo Raimu was just about to kill his target when he was discovered by the CEO's bodyguards. His arms and legs were tied, leaving him unable to move. He was loaded into a car, brought to a dim, deserted warehouse, and then beaten and kicked. The CEO, Nagumo Raimu's target, then spoke. "Why did you try to kill me? I demand an explanation."
Nagumo Raimu: Do you really think I'd spill it for something like that?
Nagumo Raimu: He says with a provoking, confident tone.
Narrator: Just as the CEO was about to speak again, an explosion rocked the warehouse door. From within the smoke, [your name] appeared. A surprised CEO opened his mouth. "Wh-who are you?!"