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My opinion: Yukio Mishima doesn't fit into the "Dai-Nippon Gothic" aesthetic. Mishima's writing is suffused by sunlight and healthy, powerful bodies, symbolic opposites of what "gothic" makes us feel. Mishima's writing is the sea under blue skies and the Ise Grand Shrine. Gothic is disease, frail bodies, lightless spaces.
The difference is that Mishima was actually a fascist and believed it was beautiful, while the Dai-Nippon gothic aesthetic uses imperialist imagery as a form of grotesque violence, mixed up with disease and perversion. Mishima's view on death can shade into this but there's a disconnect because in the gothic aesthetic, it's an outsider's perspective on fascism. Fascism as excessive violence, extravagant criminality, a heterotopia where everyday morality is reversed.
It would be wrong to reduce "Dai-Nippon Gothic" to the restrictive label 'antifascist' but I don't think real fascism can mix coherently with the aesthetic.
Writers who the "Dai-Nippon" aesthetic would do well to appropriate --- Ranpo, Yumeno Kyūsaku, maybe Izumi Kyōka, definitely much of the work of Jun'ichirō Tanizaki.
Of course, recontextualized images of Mishima can be appropriated but it's good to remember they're being twisted away from their original meaning