Yoarashi Okinu

Yoarashi Okinu (夜嵐 おきぬ, ca.1845 – March 28, 1872) is the moniker of , who was a Japanese female poisoner and geisha and lived from the end of the Edo era to the beginning of the Meiji era. Her nickname "Yoarashi" means night-storm in Japanese.
Biography.
Her early life is generally undocumented and has produced many ideas and opinion. Some sources assert that she was a daughter of a samurai of Awa Province, or she was born in Edo. There is another opinion that she was a daughter of Sajiro, a fisherman who lived on the island of Jōgashima at the tip of the Miura Peninsula. According to a non-fiction writer Atsushi Hachisu, she sold herself into geisha because her family was poor, and she worked as a geisha. There is another opinion that she was an employee at the decorative collar shop in the Nakamise neighborhood in front of Sensō-ji.
As she was beautiful, people in the Edo longed for her. She became a mistress of Ōkubo Tadayori () in the capital Edo. He was the "daimyō" of the Karasuyama Domain in Shimotsuke Province, which was rated at thirty thousand "koku". Ōkubo had a son, the successor to the Ōkubo family, by her. However, he hated her, and abandoned her in the Meiji Restoration.
She became a mistress of Kobayashi Kinpei, but she paid for sex with kabuki actor Arashi Rikaku, and then fell in love with him, so she killed Kobayashi with poison on March 2, 1871. Rikaku harbored her but they were arrested. She was sentenced to death, and she was executed by decapitation after she had a child by Rikaku.
Rikaku was sentenced to 3 years in prison, and he was released in September 1874. He became kabuki actor Ichikawa Gonjūrō after his release.
Fictional story.
Her case was reported sensationally several years after that, but many researchers such as a Japanese art historian Naoyuki Kinoshita agree that mass media adapted her and there were untruths in her tradition. In 1878, she was called a serial killer. A book characterized her as a she-devil, and her tradition is based on this virtual fiction.