Hiroyasu Koga was a young Tatenokai member responsible for the decapitation of Yukio Mishima during his seppuku on November 25, 1970. Koga, known by the nickname Furu-Koga to distinguish him from another Tatenokai member with the name Koga, was a skilled practitioner of kendo (swordsmanship). It was originally planned that Mishima would be decapitated by Masakatsu Morita , the Tatenokai's student leader; however, Morita was not trained in the sword and botched the job, at which point Koga stepped in to complete it. Koga then decapitated Morita as part of Morita's own seppuku.
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