Sayaka was in love with a female teacher, who had moral doubts about their relationship and Sayaka ended up sharing with a friend, which led to the friend revealing it publicly and the teacher killing herself. After being betrayed, Sayaka started to have trust issues. Because of that, she had a very clear image of what she wanted and received her ability. As Sayaka has a very clear idea of what she wants, got an ability to force people to keep secrets or they die. doesnt like fighting