Himari (ひまり) is a young girl who takes part in A Sunset with Orihara. After an event orchestrated by Izaya, Himari's father murdered Haruto's father. Following this, Haruto's mother fell out of sorts with Himari's mother and stabbed her before attempting to kill herself and both the children. Haruto's mother was sent to a mental institute while Himari's mother was hospitalized for her injuries. Due to this, Haruto and Himari were left temporarily parentless. Himari, being aware of Izaya's hand in the destruction of her family, hates Izaya and is far more cynical than the more upbeat Haruto.
She is darker and more cynical than Haruto but does not speak much. She is a smart girl who acts much more like an adult than a child.
Himari’s father was close friends and business partners with Haruto’s father. When their business succeeded Haruto’s father took all of the credit and became the director of the company. Himari’s father perceived this as a betrayal and hired Izaya to find an opportunity for him to kill the director and take all his money. What Izaya omitted was that the director had taken the reins of the company so he could take the full blame for a huge problem in the company and protect Himari’s father, who he would then leave the company to. Himari’s father, only learned this after killing Haruto’s father. Afterwards Haruto’s mother fell out with Himari’s mother, and eventually stabbed Himari’s mother with a chopper and tried to kill herself and both the children. She was sent to a mental institute, Himari’s mother was sent to the hospital, and the children were left temporarily parentless. In this volume Izaya uses them as his lackeys. They do not go to school.