It is revealed that she is Ryuu Miyazaki's sister.
She despised her life, having a divorced mother and a new father-in-law. Because she was in such despair, she and her brother, Ryuu Miyazaki, killed their mother and her new lover. Later, she wanted to replace Kazuki as the one who is most close to Maria, obtains the box, "Sevennight in Mud". Gradually, she possesses Kazuki's body for an increasing amount of time each attempt. However, the siblings realize they still have each other despite their mentally torn family. Riko willingly gives up the box, and Miyazaki is sentenced to prison for murder.
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