How much of an influence was Subarashiki Hibi on The Apocalypse of Herschel Schoen? The ending is very different, of course; but, in the pre-ending parts of my readthrough of the latter, I found it kind of striking how many parallels existed between the two. (Albeit with Herschel much less successful than Takuji in the "convince other people of his world-model" field.)
It wasn't that much of a conscious influence, if only because I read SubaHibi many years ago and don't remember the details of the story.
But it's possible that the parts I didn't retain in declarative memory are still somewhere up there in my head, and that they influenced TAoHS without my realizing it. Such things have been known to happen.
One fairly obvious point of inspiration that was conscious: the scene(s?) where Takuji gets up in the middle of class and starts making proclamations to his classmates.
(BTW, when I read it there was no official translation yet, and I was using an incomplete fan translation, so I never actually got to finish it. I think the fan translation covered parts 1-4 and the start of part 5, or something like that)