Mikasi was an exceller. Aside from being Principal Nezu's niece, she was part of a confidential separate class with special students. When they heard of Class 1-A being attacked in USJ, their class was deployed since they already have their hero licenses. Class X has been confidential all this time, but they are now ready to be introduced to the world. Mikasi, together with her classmates, Akiro, Kenji and Sakae, will take part on being vice-teachers of different classes in UA. And Mikasi was assigned in Class 1-A.