I wrote the following that other review site, written immediately after finishing Sun and Steel a few years ago. I still couldn't say it any better...

Mishima at his densest, finest, weirdest, most metaphysical. He wrote this just before doing his Big Thing, and this does, really, feel like a manifesto of the sort popular among suicide bombers, Christian millenarians, militia leaders in the American Far West, and 4chan regulars turned school shooters. That last bit is especially noteworthy. If Mishima was alive today, giving his predilection for samurai ideology and whatnot, I can see his teenage self posting edgelord memes had he been alive today.