Shiina Yuya is a bounty hunter interested in the largest bounty she can find, that of 1,000,000 ryo that is on the head of Demon Eyes Kyo. She decides to follow Kyoshiro, bonding with him until he is "put to sleep" by the reappearance of Kyo. When Kyo wakes up completely, she follows him. In spite of his attitude, she comes to trust and believe in Kyo. In the forest of Aokigahara, she learns that Kyoshiro killed her older brother and decides to wait until he returns to the surface in order to get an explanation from him. Yuya is thus interested in Kyo and Kyoshiro. She apparently knows the secrets of the Mibu Clan, things that her brother Nozomu would have shared with her before dying. The Aka no Oh also comes to believe that she is a seer, but this is neither confirmed nor disproven. Around the end of the manga, while telling her brother that she wouldn't forgive him if he killed Kyo, she admitted out loud in front of everybody that she was in love with Kyo.