 Light agrees in order to use her Shinigami Eyes and even though he tells her upfront their relationship will only be an act, she believes she can ultimately win his love.According to Ohba, Light sees Misa as a "bad person" who killed innocent people, so he acts emotionally cold towards her and manipulates her.Light and Misa both act together as Kira for over five years, until Light decides that it is too dangerous for Misa to be Kira with members of the task force suspecting him and tells her to give up the notebook.