I don't have much to say that hasn't already been said. The writing in this touching grass quest was simply outstanding. To wit, the latter part was the weakest part of the game for me (I'm allergic to TeruMoko), and it still made me smile, laugh, and even tear up.
The epilogue nearly floored me. Almost every line hit hom— erm, hard. Spoilers, ROT13: Nsgre frrvat Xbgbuvzr'f ivfvba rathysrq va synzr, erzvavfpvat gung fur'q ab ybatre unir ure pbyyrpgvba, V jnf n ovg pbashfrq jura ure sevraqf jrer rkcybevat ure hafpngurq ubhfr. Vg gbbx zr n zvahgr orsber V ernyvmrq... Wrfhf Puevfg, qvq Xbgbuvzr whfg frg urefrys ba sver!? V qrsvavgryl jnfa'g rkcrpgvat gb frr n znva punenpgre qvr va n wnz tnzr (bhgfvqr bs zl bja artyvtrapr), rfcrpvnyyl abg ivn fhvpvqr. V pbhyq or pbzcyrgryl jebat, ohg...
The only possible flaw that I noticed was that Kotohime seems to go out of the way to avoid sharing her name (the game's title uses a direct translation of her name, as do many of the characters, her dialogue boxes are labelled "me", and she leaves to go not use the bathroom when Mokou asks her for it), but she was fine with plastering it all over her newfangled "video game" thing. Is the implication that "Kotohime" is just a title, and that she has no real name?