Shion Kozakura
Song: Gunjou Rein (Ultramarine Rain) First appeared in Imagination Forest. A half-human, half-Medusa woman who was Mary’s mother. She lived in the forest with Mary. Fearing Mary will be rejected by humans, she kept her from going outside into the world. One day, Mary disobeys her and goes outside only to get attacked by humans. In that situation, she used her power to turn him into stone in order to protect Mary. However, the strain on her body was too great for her to bear, resulting in her death. Regarding Heat Haze. Mary died anyway and both enter the Heat Haze/Kagerou Daze where Azami passed on her Combining Eyes ability to Mary to save her. She is left behind with Azami in the Heat Haze. In the true ending, she congratulates Mary for making the choice she thinks is right. (Source: Vocaloid Wikia, pixiv Encyclopedia)