Muu enjoys causing trouble, but not getting caught doing it. they'll often do things to watch the end result, whether it's positive or negative for others. they struggle to focus and stay on-track of tasks and often fail to do simple things. their best friend is Paint, a second-year Kamiyama High student, who takes part in their troublemaking, and Rui Kamishiro, Paint's classmate, who they often make fun of for Paint having a crush on. Muu is in class 1-A with Mizuki Akiyama and An Shiraishi.