Mayami Tanaka

Manabus younger sister. Mayami is revealed to be a masochist and ever since Reina accidentally hit her Mayami began expressing affection for Reina and wishes Reina to become her honored sister. Though she is very cute and popular with boys she thinks that men who hit women are scum and will only like Reinas punches. Her personality is very blunt optimistic and bouncy making her opposite of Manabu. Source: Yandere Kanojo Wiki