Strange ''Touhou'' fangame made in the ''Danmakfu'' program. The plot is difficult to summarize without spoilers, but our own [[Franchise/TouhouProject favorite Miko and her Magician friend]] discover that [[TheMultiverse there is not only one Gensokyo]]....

More in depth: [[spoiler: Reimu discovers odd creatures seeping through a small gap similar to the ones Yukari makes near her shrine. The gap turns out to lead to a strange otherworld that turns out to be the Old [[SpellMyNameWithAnS Gensoukyou]] of the PC-98 games. There, Reimu and Marisa must repair the damage their unknowing departure caused to the world, while also trying to find out what severed the two Gensokyos in the first place, and why they can't remember anything about the old one.]]

An unusually meta Touhou game that rivals ''Concealed the Conclusion'' in terms of headiness.

!!tropes that apply to ''Touhou Retro''

* AfterTheEnd: [[spoiler: Old Gensoukyou]] is completely in tatters.
* BossSubtitles: Some are old, some are new. [[spoiler: Rin's is notable, as it's just "????"]].
* BulletHell: Averted for the most part, actually! The game is quite easy, especially for a Touhou fangame. It only gets ridiculous on Lunatic difficulty.
** Though, [[spoiler: Rin's last spellcard, "The Army of Forgotten Souls" does qualify regardless of difficulty.]]
* CallBack: Marisa, to [[spoiler: Shingyoku's female form.]]
--> '' '''Marisa:''' Bitch, get out of the way! ''
* Cloudcuckoolander: [[spoiler: Kotohime]], true to form. A helpful example, though.
* CutScene: Present, unusually for a Touhou game (fan or otherwise).
* EarnYourHappyEnding: Meta example, and how. You best be prepared to one-credit the game on Lunatic to get [[GoldenEnding the absolute best ending.]] How well you do ties into how good your ending is, and this is subverted in that it's possible to get the second-best on even Easy.
* HaveWeMet: The first indication that [[spoiler: Marisa's memory is returning is when she meets Mima for the "first" time, and asks this.]] Likewise, something similar happens with [[spoiler: Reimu and Genji]].
* IDidWhatIHadToDo: [[spoiler: Yukari's]] justification for [[spoiler: splitting Gensokyo and Old Gensoukyou. Having the two in the same space would've ruptured reality and destroyed them both.]] So it's a bit more understandable then your average example.
* LetsGetDangerous: We learn that [[spoiler: Ruukoto has apparently bonded with Utsuho over their shared nuclear-ness. She's picked up a few tricks.]]
-->''☢ CAUTION ☢ CAUTION ☢''
* Meido: Sakuya and [[spoiler: Ruukoto]], they don't get along too well. Something about "differences in maiding style" is briefly mentioned as a reason why.
* MythologyGag: Several spellcards have names that refer to or pun off of assorted things from the fandom. Particularly [[spoiler: Rin]]'s "Highly Responsive Lost Player" and Mima's "Twilight Spark"
* OminousLatinChanting: "Behold The Army of Forgotten Souls", aka [[spoiler: Rin's theme]].
* Retraux: The girls take on their [[spoiler: PC-98 appearances when they enter Old Gensoukyou. This somehow happens even to characters who never had a PC-98 appearance.]]
* RippleEffectProofMemory: Yuuka is literally the ''only'' one aside from [[spoiler: Yukari]] who still remembers when [[spoiler: Old Gensoukyou and Gensokyo were one.]]
* SpellMyNameWithAnS: Invoked. "Gensokyo" and "Gensoukyou" are not the same place. [[spoiler: At least not anymore.]]
* SpellMyNameWithAThe: It's apparently ''The'' [[spoiler: [=YuugenMagan=] ]], that's according to her, of course.
* TheMentor: [[spoiler: Genji]]. Reimu is smart enough to listen to him this time around, though.
* TheWoobie: [[spoiler: Ruukoto]], who is absolutely overjoyed at seeing her mistress again. And [[spoiler: [[WoobieDestroyerOfWorlds Rin Satsuki]] ]]
** [[spoiler: Rin]]'s backstory in particular is just depressing. [[spoiler: She's a child who got lost centuries ago in the outside world, and this somehow transformed her into a Youkai. Her power? ''The ability to be forgotten.'' This is why ''no one'' in either Gensokyo has any idea who she is (it also explains her DummiedOut status in EoSD in a rather roundabout way). This infuriates her to no end, and she is quite literally ready to destroy the world because of it.]] Luckily, [[spoiler: the game's best ending sees her cured.]]
* TheUnfought: [[spoiler: Ryuujin]] who is mentioned a few times as the only creature who [[spoiler: exists in both Gensokyos, and the only reason Old Gensoukyou isn't gone entirely]], it's pretty heavily set up that he'll be fought, but he never is. It's speculated in-game that [[spoiler: he could never make himself weak enough to put up a danmaku fight that wasn't entirely one-sided in his favor.]]
* TrueFinalBoss: [[spoiler: Sariel, in the hidden Phantasm stage which comes with its own mini-plot, involving her creating the first incident in the newly-reintegrated Gensokyos. She doesn't quite grok the spellcard system yet and her battle is....''interesting'' because of this.]]