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 the emperor. He succeeded only in irritating the soldiers, and was mocked and jeered. He finished his planned speech after a few minutes, returned to the commandant's office and performed seppuku. The assisting "kaishakunin" duty at the end of this ritual (to decapitate Mishima) had been assigned to "Tatenokai" member Masakatsu Morita, who was unable to properly perform the task. After several failed attempts at severing Mishima's head, he allowed another "Tatenokai" member, Hiroyasu Koga, to behead Mishima. Morita then knelt and stabbed himself in the abdomen and Koga again performed the "kaishakunin" duty. This coup is called in Japan.