A high school student with a bright and cheerful personality, Haru also happens to be the target of the 12 assassins of Black Class. She is roommates with Tokaku. Due to her familial situation, since a young age she has been the target of many assassination attempts. Undeterred by this, Haru makes it a point not to cry even though she is caught within such unfortunate circumstances. She is determined to graduate despite knowing she is being targeted.