User blog comment:CosplaySan/The Real Summertime Record/@comment-5986522-20140819152035

That's a nice theory - but only a theory. It contradicts many fragments of the story, and if that was really the case, then Jin would have put the focus on Haruka/Konoha (who had an extremely minor role during the whole story, until the end), not Marry, Shintaro and Ayano for the most part, and the end would have revealed something along the lines, but it was Marry's monologue at the end of the anime, not his. Therefore, it's rather unlikely that the whole story is just a dream Haruka had.