History NightmareFuel / KoishiKomeijisHeartThrobbingAdventure

* Koishi's flower fortune telling, which involves ripping legs off of a grasshopper. It's not as scary as the other examples, but it's probably the first sign that something will go wrong

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* Nazrin and Shou getting the death penalty for not sharing Byakuren's madness-induced ideal and refusing to attack humans.

* Nazrin and Shou getting death penalty for not sharing Byakuren's madness-induced ideal and refusing to attack human.

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kkhta_warning_sign.png]]
[[caption-width-right:350:A Touhou doujin artist put a ContentWarning in their fan video series. Are you sure you still want to watch this series despite the warning?[[labelnote:Warning Translation]]This is a fan video of Touhou. If you do not wish to corrupt your view of Gensokyo, press the back button. There is more than one Gensokyo.[[/labelnote]]]]

* Yuyuko eating [[spoiler:Youmu, her gardener and most loyal servant]].

* Yukari [[spoiler:losing Ran and Chen in a gruesome manner while getting curbstomped herself]] in the most painful way.
* The NightmareFuelColoringBook which is used as the intro of Episode 5 is grossly horrifying and twisted. Even more so after it is revealed that the picture book is a manifestation of [[spoiler:Koakuma]]'s inner hatred for everyone and her obsession toward [[spoiler:Patchouli]].
* Nazrin and Shou [[spoiler:getting death penalty for not sharing Byakuren's madness-induced ideal and refusing to attack human]].
* [[spoiler:Giant, frenzied Gensokyo residents]] invade earth and managed to wipe out enough humans to drop the population down to 95%... then 94%... (this means that over 420 ''million'' people have already died and it's only getting worse from there).

* The fact that all of this started from something innocuous, just a simple request to use a [[spoiler: fishing rod]].

[[caption-width-right:350:A Touhou doujinshi content maker put a ContentWarning in their fan video series. Are you sure you still want to watch this series despite the warning?[[labelnote:Warning Translation]]This is a fan video of Touhou. If you do not wish to corrupt your view of Gensokyo, press the back button. There is more than one Gensokyo.[[/labelnote]]]]

* Yukari [[spoiler:lost Ran and Chen in a gruesome manner while getting curbstomped herself]] in the most painful way.

* [[spoiler:Koishi ripping out Hong Meiling's throat down to the spine.]]
* [[spoiler:Mokou burning down the Human Village for kicks and giggles.]]
* [[spoiler:Yuyuko eating Youmu, her gardener and most loyal servant.]]
* [[spoiler:Sanae torturing Kogasa and having killed Mystia off-screen.]]
* [[spoiler:Yukari getting killed because Ran had a bomb sewn into her stomach, which explodes, getting shredded to pieces with Reisen II's timewarp rifle, and Chen having a second bomb sewn into her stomach which also explodes. In that order!]]
* [[spoiler:Nazrin and Shou getting executed by decapitation for not sharing Byakuren's madness-induced ideal and refusing to attack human.]]
* [[spoiler:Giant, frenzied Gensokyo residents invade earth and managed to wipe out enough humans to drop the population down to 95%... then 94%... (this means that over 420 ''million'' people have already died and it's only getting worse from there).]]

'''Everything''' about this is in some way or another the stuff nightmares are made of. Some of the more notable examples:* [[spoiler:Koishi ripping out Hong Meiling's throat down to the spine.]]

* [[spoiler:Giant, frenzied Gensokyo residents invade earth and managed to wipe out enough humans to drop the population down to 95%... then 94%... (this means that over 420 ''million'' people have already died and it's only getting worse from there).]]