Takiko was Genbu No Miko two hundred years before Miaka and Yui's time, because she had called Genbu, and merged with him, she was dying upon returning to Japan. Not wanting to
see his daughter in so much pain, Takiko's father killed her to give her peace. It was this "crime"
that Keisuke and Tetuya found in the library to lead them to Oosugi Suzuno.