Kataoka, Megu

She is a student of Kunugigaoka Junior High School. She is assigned to Class 3-E, where she trains to become a professional assassin, with her teacher as the target. She is one of the two class representatives of Class 3-E, with the other being Yūma Isogai.

She once tried to teach a classmate by the name of Kokona how to swim. Upon failure to do so, Kokona blackmailed Megu into giving her tutoring in every class. Having to be too focused on Kokona's learning rather than her own, Megu's grades fell and she landed herself in class E.

(Source: Ansatsu Kyoushitsu Wikia)