Sawako Kubo

Kubo Kouji's younger sister, who died eight years before the start of the series. Her psychic powers exceeded even Kubo's, which took an enormous toll on her. She committed suicide by jumping from their apartment balcony after accidentally killing her mother by injecting her with negative energy when she was only seven. She continued leaping to her death in an infinite loop in the "dark world" in the afterlife, where Kubo watched over her the whole time, until Riyon discovered her, drew her out into the human world, and purified her using Kasuga's life force at his request so she could pass over peacefully.