A read Mein Kampf in two different language, also I'm studying the works of Julius Evola. I have never read principles there like the death of head of the state would mean the death of the nation. There's lots of talk about hierarchy and of course, absolute power (but it means absolute responsibility too).
North Korea is rather an extremist bolshevik state, rather than fascist and also a very dangerous one, but making a parallel with Japan is not so smart. It's very far away from Yukio Mishima and so.
It's certainly true that you didn't see the deification of the head of state as part of Nazism or Italian fascism. But it was very much part of the imperial Japanese ideology which might or might not be fascist depending on how you define the term. So you could easily argue that Japanese or North Koreans aren't really fascists. You can even argue about whether the Nazis were truly fascist but where their own thing.
I can't say I'm particularly familiar with Yukio Mishima and his coup attempt but I imagine the ideologies have to evolve when they don't have a Kempeitai working on their side behind the scenes.
North Korea is rather an extremist bolshevik state, rather than fascist and also a very dangerous one, but making a parallel with Japan is not so smart. It's very far away from Yukio Mishima and so.