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Yamanashi had killed her parents and then in order to hide the motive, begun to kill other humans. She killed her parents because they let her bedridden grandfather, who was a burden for their family, die without helping him.
She has long black hair, luminous eyes and a lovely voice. But the agonist disorder had transformed her into a human beast with claws as hands and she is now known as the "lawn mower". Her claws are disintegration weapons, who will tear of all things who are caught in them. Combined with her acrobatic, speed, accuracy and power she gained from the disorder, is she an powerful enemy. She additionally acquired an instantaneous sense of danger thanks to her two years of human hunting experience. Howewer, the serial killings had lead the hunter of the demon-possessed, [character=26872]Shuusei[/character], to her. Later, she was taken into custody by the Olga Memorial Hospital Ward C and they imprisoned her in a cage. Her fate is unknown.