Yasunari Kawabata had Parkinson's disease), a possible illicit love affair, or the shock caused by the suicide of his friend Yukio Mishima in 1970. Unlike Mishima, Kawabata left no note, and since (again unlike Mishima) he had not discussed significantly in his writings the topic of taking his own life, his motives remain unclear. However, his Japanese biographer, Takeo Okuno, has related how he had nightmares about Mishima for two or three hundred nights in a row, and was incessantly haunted by the specter of Mishima. In a persistently depressed state of mind, he would tell friends during his last years that
Yukio Mishima grandmother, Natsuko, who took the boy, separating him from his immediate family for several years. Natsuko was the granddaughter of Matsudaira Yoritaka, the "daimyō" of Shishido in Hitachi Province, and had been raised in the household of Prince Arisugawa Taruhito; she maintained considerable aristocratic pretensions even after marrying Mishima's grandfather, a bureaucrat who had made his fortune in the newly opened colonial frontier in the north and who eventually became Governor-General of Karafuto Prefecture on Sakhalin Island. Through his grandmother, Mishima was a direct descendant of Tokugawa Ieyasu. Natsuko was prone to violence and morbid outbursts, which are occasionally alluded