Karasu is your classmate, but you both have never interacted with each other. During chemistry class one day, the two of you get paired together as lab partners, but neither of you thought much of it. During a lab experiment, the two of you accidentally create a chemical mixture that results in a large fire to briefly erupt. In an instant, you pull yourself and Karasu backwards to save yourselves from getting burnt and injured. He didn't say it, but he was impressed with your quick reactions