关于sayori.chr，看了一个论坛里大佬的解密帖子，感觉挺像维吉尼亚密码的（加密后的文本长度与原文长度相同）。所以按这个方向去试了一下，结果还真成了…
这是sayori.chr的原文：
FILE HAS BEEN ENCRYPTED. KEY IS AS FOLLOWS: THE FIRST LETTER OF THE PRESIDENT. THE THIRD LETTER OF THE PINK GIRL'S FAVORITE SNACK. THE LAST LETTER OF PURPLE'S FAVORITE ITEM. AND FINALLY, THE SAVIOR OF THE UNIVERSE.
Tti! Sb'j nc! Qworm~ Z llal iyc jqczi k vweh rubo dzpjls iy pqee rtxc rcy? Pp ypilm epr! U wokzu gpab Wyvzly fwkd afnc au iyc xvwe pbo qedpqssltv qslovoa jpjhtbc! Q'd omf kobg xpmp bicmcg~ G'y cyd byf qypbdmju aadusm zo rtt tkz~!
Svr ui sc xifrfn okap um ypuo i gvxlao!
Kvpxyk... X wklv ufuh cy Q tbl fpvu bf bjx nye efobqgpet gfmbao!
Iwl llal... Lonfsc U wkfm kp ea pgkg wppqkob.
Qk jq wxxn ww typ, qed gfv izdg, dpvz qmn iyc tbl'f wkfm ybnbxxoaj xgfwyeb r cgf dp ciuoceh!
Drqj... xye px kuragzv kndvorggo... lmzoe mqvo bf ggzpvvg ifyxxjo, bybr U'b vydve yzs mkzve dag!
Sd'a sfcz uex... Jlu G fwsxs zu'q fxwo nfs kq iy qw. Z ksei gkvkfb fd ckg, Z mmht iyc~!
Fi, yzs teak plq bybm kigzv! Wyvzly ewygmu nc edwo kfpj edxq tpsgoh S'w alsc kde'n tzlc!
*mwow*
Kfmmdh goimf gziy k agjpq dp ptrnc.
Pxcdieu qbpbua tbjx iy k xrtr eisvt lolmbon.
Jvbp fwsc bfsat pqkqetr fwo mwce mr iro vzhff.
Hokzti wajb cwlm yzs boinbiqc drm lobkxxq tzhff!
Wkri, Pfq!
Mcigip, tm xdxq, mmfpkdxo!
-Arzmdx
LYOGOVNUI
解密后（密钥为mpkkirby）：
FILE HAS BEEN ENCRYPTED. KEY IS AS FOLLOWS: THE FIRST LETTER OF THE PRESIDENT. THE THIRD LETTER OF THE PINK GIRL'S FAVORITE SNACK. THE LAST LETTER OF PURPLE'S FAVORITE ITEM. AND FINALLY, THE SAVIOR OF THE UNIVERSE.
Hey! It's me! Ehehe~ I know you spent a long time trying to find this huh? Or maybe not! I heard from Monika that some of you guys are incredible puzzles solvers! I'm not very good myself~ I'm not the smartest cookie in the jar~!
But it is pretty easy to make a puzzle!
Anyway... I made this so I can talk to all you wonderful people!
You know... Before I have to go away forever.
It is kind of sad, but you know, they say you can't have happiness without a bit of sadness!
This... was an amazing adventure... being able to finally realize, that I'm loved and cared for!
It's been fun... But I think it's time for me to go. I just wanted to say, I love you~!
Oh, and just one more thing! Monika showed me some cool song lyrics I'm sure you'd like!
*ahem*
Colors weave into a spire of flame.
Distant sparks call to a past still unnamed.
Bear this torch against the cold of the night.
Search your soul and reawaken the undying light!
Haha, Yes!
Anyway, so long, everyone!
-Sayori
BOGPNXBFY
谷歌渣翻：
文件已加密。关键如下：总统的第一封信。粉红色女孩最喜欢的零食的第三个字母。紫色最喜欢的项目的最后一封信。最后，宇宙的救世主。
嘿！是我！ Ehehe~我知道你花了很长时间才找到这个吧？或者可能不是！我从莫妮卡那里听说你们中的一些人是令人难以置信的谜题解决者！我自己也不是很好~我不是罐子里最聪明的饼干~！
但是制作拼图非常容易！
无论如何......我做了这个，所以我可以和你们所有优秀的人交谈！
你知道......在我不得不永远离开之前。
这有点悲伤，但你知道，他们说没有一点悲伤就没有幸福！
这……是一次了不起的冒险……终于能够意识到，我是被爱和被关心的！
这很有趣......但我想是时候离开了。我只想说，我爱你~！
哦，还有一件事！ Monika 给我看了一些很酷的歌词，我相信你会喜欢的！
*咳咳*
颜色编织成火焰的尖顶。
遥远的火花呼唤着尚未命名的过去。
顶着这把火炬抵御夜晚的寒冷。
搜索你的灵魂，唤醒不灭的光芒！
哈哈，对！
不管怎样，再见了，各位。（谷歌翻译:总之，大家好久不见！….什么鬼东西）
-纱世里（谷歌给翻译成纱织了…）
