Kumatarō Kido and Yagorō Tani dating history

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Kumatarō Kido (城戸 熊太郎, Kido Kumatarō, c.1857–1893) and Yagorō Tani (谷 弥五郎, Tani Yagorō) were Japanese spree killers who killed 11 people, including an infant, on May 25, 1893, a spree known as Kawachi Jūningiri (河内十人斬り). The roots of the killings were both emotional and financial. Kido lost his common-law-wife to a man named Torajirō Matsunaga, whose brother, Denjirō, defrauded money from Kido and assaulted him. Along with a pupil named Tani Yagorō, Kido decided to kill Matsunaga's family. They prepared guns and swords and on May 25, 1893, they attacked Denjirō's house and killed four people. They then attacked Denjirō's son's house, killing five people. They also killed his former common-law-wife and her mother. However, they were not able to kill Torajirō Matsunaga. They committed suicide after the murders, and their remains were discovered on June 7. A novel, Kokuhaku by Japanese punk rock singer Kō Machida, was based on their case.