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This was and still remains one of the best free doujin vn's out there; I'd actually go to such lengths as to say anyone who hasn't read it yet should feel awfully bad and guilty about it. It's definately worth a read, especially if you're a fan of Sakurai and WAB series, since her and Shiba's writing bear a lot of similiarities and Shiba is a master when it comes to skillful usage of moody settings. That aside, if you're a proud owner of a 3DS (or simply have an emulator), there is a renewal version available, called TRUE REMEMBRANCE ～記憶のかけら～, released in 2012, which - suprisingly - almost no one knows about. It's worth a grab, mainly because of new, polished art and music, as well as new content.

I remember reading (and subsequently reviewing) this a while ago - one of those hidden indie VN gems, really. I personally feel a bit... weirded out by upscales, but I can understand that an upscale done with a well-suited algorithm at no time limit might look better than whatever your GPU will give you. As for Mimei, I had never heard of it before, and therein lies at least part of your answer