Sayaka Koyanagi is a young girl who formed a group of Collectors to gather hundred coins. 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 images on what she wanted and received her ability. (Source: Gleipnir Wiki)