Japan’s Wakayama Prefecture tycoon Kosuke Nozaki’s will dispute comes to an end, the Supreme Court dismisses the family lawsuit
Quick Look
- Kosuke Nozaki, a 77-year-old rich man from Wakayama Prefecture, Japan, died suddenly three months after his marriage to 22-year-old AV actress Saiki Sudo.
- His will donated all of his property of about 1.5 billion yen to Tanabe City.
- The family filed a lawsuit claiming that the will was invalid.
AI-generated summary
Why It Matters
Kosuke Nozaki, who called himself "The Killer of 4,000 People" and was called "Kishu Don Juan", wrote a will in red pen on February 8, 2013, donating his personal property to Tanabe City.
Kosuke Nozaki, a 77-year-old wealthy man from Tanabe City, Wakayama Prefecture, Japan, who claimed to be the "Kishu Don Juan" and "the Don Juan of Kishu", died suddenly in his residence on May 24, 2018, just three months after his marriage to 22-year-old AV actress Sutaka Saki. Before his death, he left a will to donate all his property to Tanabe City. His family was dissatisfied and filed a lawsuit, but now it has been rejected by the Supreme Court. The family is certain that they will not get the inheritance.
According to the "Sankei Shimbun" report, Nozaki Kosuke wrote and signed his will in red pen on February 8, 2013, and he wanted to donate all personal property to Tanabe City after his death. The family subsequently asked the court to rule that the will was invalid. However, at the first instance in June 2024, the Wakayama District Court believed that the will was consistent with Nozaki Kosuke's handwriting. He often used red pen during his lifetime and made repeated donations to Tanabe City and other units, so the will was deemed valid.
The second instance of the Osaka High Court in September 2025 and the third instance of the Supreme Court of Japan on September 30 this year both upheld the original verdict, pointing out that the words left by Kosuke Nozaki complied with the provisions of the will. When the inventory was counted in July 2019, his estate was approximately 1.5 billion yen (approximately NT$300 million). In addition, Sudo Hayaki was arrested on suspicion of murder after the death of Nozaki Kosuke, but was acquitted in both the first and second trials.
Open Questions
- Was Sudo Hayaki involved in the death of Nozaki Kosuke?
- Does the will truly reflect Nozaki Kosuke’s final wishes?







