Originally Eri Fujikawa before taking her mother's maiden name. Her ability is memory manipulation via eye contact; if she maintains eye contact with a person for 5 seconds, she can change the person's memories - inserting or deleting memories that she wants.
She is often called upon by the Bureau to "seal" abilities by making someone forget how to use them.
Asai Kei helped her blackmail her abusive father and suggested she take her mother's name. Eventually, however, these actions caused her to adopt a personality that put her at odds with Kei's new methods. Believing him to be now be weak.