History YMMV / YuNo

* AdaptationDisplacement: A minor case: when the 2019 anime began airing many watchers were unaware that it was originally a revolutionary computer game from 1996. Cue many immediately accusing it of [[TheMockBuster ripping off]] ''VisualNovel/SteinsGate'', despite the latter more likely being the one taking influence from ''YU-NO''. [[OnceOriginalNowOverdone Many didn't understand why the anime had so many cliché tropes, despite the game popularising or originating many of them.]] The word about its origins spread quickly, however.

* OnceOriginalNowOverdone:

* AdaptationDisplacement: A minor case: when the 2019 anime began airing many watchers were unaware that it was originally a revolutionary computer game from 1996. Cue many immediately accusing it of [[TheMockBuster ripping off]] ''VisualNovel/SteinsGate'', despite the latter more likely being the one taking influence from ''YU-NO''. [[SeinfeldIsUnfunny Many didn't understand why the anime had so many cliché tropes, despite the game popularising or originating many of them.]] The word about its origins spread quickly, however.

* SeinfeldIsUnfunny:
** This game has influenced so many later visual novels that nowadays, it's hard for most people to see why it was so groundbreaking. It's the first or one of the first in the medium to feature [[DoorStopper an epic-scale plot]], and the [[JigsawPuzzlePlot "multiple route mystery"]] structure, among others. In western countries, this is furthered by the fact that the game [[LateExportForYou didn't receive a translation until 2011]], long after many of its "imitators" were released for western audiences. One way this manifests itself is that in the Japanese visual novel database site Erogamescape, made largely of the original audience, it's rated much higher (at or near the top) than by Western visual novel readers at VNDB, though it has gotten some newfound appreciation after the remake got localized.
** The Visual Novel was released in 1996, ''well'' before the [[TrappedInAnotherWorld Isekai trend]] began in TheNewTens. However, the anime adaptation had the misfortune of airing in 2019, right when that fad was at its peak. Thus, some viewers who were thoroughly impressed with the Time Travel/Alternate Timeline thriller of the first half were puzzled and annoyed by the fact that the story suddenly shifted into yet another Isekai by the second half.

* IdiotPlot:
** Ayumi's route, which requires her to actively work towards Toyotomi’s manipulations and sexual abuse (despite ''him'' working for ''her'' and not the other way around), be incompetent in even the smallest part of her high-ranking job[[note]]which was stated to be given to her to continue her husband’s work, rather than earned, so that much is understandable at least.[[/note]] and refusing all possibility that the bad things that happen tend to be his fault. While her assuming Takuya is acting out of jealousy is understandable at first considering his personality, she encourages Toyotomi's sexual abuse by not using her position as his superior even when [[spoiler:he tries to rape her despite having zero leverage on her]], and never even considers that he's the villain, not the hero. Notably, the bad end has Takuya [[spoiler:interrupt a much more in-progress rape and try to tell Ayumi that Toyotomi's responsible for all the bad stuff that happened to her that route, and her response is to tell him to leave, then chase him off when he tries to get rid of Toyotomi. This is despite Toyotomi not having any combat training and Takuya being adept in a fist fight, which she's aware of. Presumably, he goes right back to raping her once Takuya is driven off, with Takuya returning only after she's committed suicide.]]
** A frustrating amount of scenes have Takuya adamantly refuse to do anything until he's looked at everything, and well after he's deliberately ruined the element of surprise if he had it. This is in spite of both the wooden ''and'' iron sword being perfectly capable of being used as non-lethal weaponry (he does comment on the iron one being lethal, but he knows his way around a blade and can use the blunt end), and there not being any reason to not launch a surprise attack.

* AdaptationDisplacement: A minor case: when the 2019 anime began airing many watchers were unaware that it was originally a revolutionary computer game from 1996. Cue many immediately accusing it of [[TheMockBuster ripping off]] VisualNovel/SteinsGate, despite the latter more likely being the one taking influence from ''YU-NO''. [[SeinfeldIsUnfunny Many didn't understand why the anime had so many cliché tropes, despite the game popularising or originating many of them.]] The word about its origins spread quickly, however.

* CompleteMonster: In the 2019 anime, the [[spoiler:[[BigBad entity who controls Ryuuzouji]] is an extraterrestrial criminal who usurped the body of Eriko Takeda's lover, Abel, during their research on other dimensions. Slowly getting bored with Abel's body, he then brutally murders a man named Ryuuzouji and [[GrandTheftMe controls his body]]. To cover up his tracks, the entity then made up a curse by brutally murdering several innocent people. Taking an interest on a device known as Reflector Device that Kodai Arima and his son, Takuya, had, the entity then uses the powerful brainwashing power known as Niarb to control several people so that he could gain the device. Revealed to be one of the notable figures in another dimension known as Dela Granto, it was soon revealed that he manipulated the Great AI and the God Emperor for his own gains before being {{sealed|Evil In A Can}} by the latter. Escaping from his confinement, the entity then attempts to stop the ritual of Dela Granto which would [[OmnicidalManiac wipe out both Dela Granto and Earth]], and it was revealed that he already destroyed 3 dimensions for his own amusement. When stopped, the entity then summons the ghosts from other dimensions to attack the innocent people in Dela Granto.]]
* CrossingTheLineTwice: In ''8-bit YU-NO's Big Adventure'', You can summon and ride Kun-Kun the friendly Nogard! What happens if you get hit? [[spoiler:She turns into a chicken leg Yu-No can gleefully eat to gain back health, as a ''very'' BlackComedy-esque CallBack to the True route.]]
* IdiotPlot: Ayumi's route, which requires her to actively work towards Toyotomi’s manipulations and sexual abuse (despite ''him'' working for ''her'' and not the other way around), be incompetent in even the smallest part of her high-ranking job[[note]]which was stated to be given to her to continue her husband’s work, rather than earned, so that much is understandable at least[[/note]] and refusing all possibility that the bad things that happen tend to be his fault. While her assuming Takuya is acting out of jealousy is understandable at first considering his personality, she encourages Toyotomi’s sexual abuse by not using her position as his superior even when [[spoiler:he tries to rape her despite having zero leverage on her]], and never even considers that he’s the villain, not the hero. Notably, the bad end has Takuya [[spoiler:interrupt a much more in-progress rape and try to tell Ayumi that Toyotomi’s responsible for all the bad stuff that happened to her that route, and her response is to tell him to leave, then chase him off when he tries to get rid of Toyotomi. This is despite Toyotomi not having any combat training and Takuya being adept in a fist fight, which she's aware of. Presumably, he goes right back to raping her once Takuya is driven off, with Takuya returning only after she’s committed suicide.]]

* InferredHolocaust: [[spoiler:Ayumi’s route strongly implies that Mio was trapped beneath Triangle Mountain just like in her own route. By the apparent mechanics of the Reflector and alternate dimensions, this means that Mio probably dies beneath Triangle Mountain in every route apart from her own, despite Takuya being the one to find a way out in her route, and only through what was functionally an illusion she didn't see. [[NoEndorHolocaust But hey, Mio does technically have an escape route so long as she doesn’t give up… right?]]]]

* {{Squick}}: [[spoiler:Takuya makes a few creepy comments about Yu-No's body once they meet again in the Imperial Capital and he realizes that SheIsAllGrownUp. Later, after learning the truth about Dela Granto, they kiss, and, in the original version, have sex. ''[[ParentalIncest Yu-No had sex with her biological, blood-related father.]]]]''

* IdiotPlot: Ayumi's route, which requires her to actively work towards Toyotomi’s manipulations and sexual abuse (despite ''him'' working for ''her'' and not the other way around), be incompetent in even the smallest part of her high-ranking job[[note]]which was stated to be given to her to continue her husband’s work, rather than earned, so that much is understandable at least[[/note]] and refusing all possibility that the bad things that happen tend to be his fault. While her assuming Takuya is acting out of jealousy is understandable at first considering his personality, she encourages Toyotomi’s sexual abuse by not using her position as his superior even when [[spoiler:he tries to rape her despite having zero leverage on her]], and never even considers that he’s the villain, not the hero. Notably, the bad end has Takuya [[spoiler:interrupt a much more in-progress rape and try to tell Ayumi that Toyotomi’s responsible for all the bad stuff that happened to her that route, and her response is to tell him to leave, then chase him off when he tries to get rid of Toyotomi. This is despite Toyotomi not having any combat training and Takuya being adept both in a fist fight and with a sword ''and'' getting the wooden sword earlier in Ayumi's route, all of which she's aware of. Presumably, he goes right back to raping her once Takuya is driven off, with Takuya returning only after she’s committed suicide.]]

* CrossingTheLineTwice: In ''8-bit YU-NO's Big Adventure'', You can summon and ride Kun-Kun the friendly Nogard! What happens if you get hit? [[spoiler: She turns into a chicken leg Yu-No can gleefully eat to gain back health, as a ''very'' BlackComedy-esque CallBack to the True route.]]
* IdiotPlot: Ayumi's route, which requires her to actively work towards Toyotomi’s manipulations and sexual abuse (despite ‘’him’’ working for ‘’her’’ and not the other way around), be incompetent in even the smallest part of her high-ranking job[[note]]which was stated to be given to her to continue her husband’s work, rather than earned, so that much is understandable at least[[/note]] and refusing all possibility that the bad things that happen tend to be his fault. While her assuming Takuya is acting out of jealousy is understandable at first considering his personality, she encourages Toyotomi’s sexual abuse by not using her position as his superior even when [[spoiler:he tries to rape her despite having zero leverage on her]], and never even considers that he’s the villain, not the hero. Notably, the bad end has Takuya [[spoiler:interrupt a much more in-progress rape and try to tell Ayumi that Toyotomi’s responsible for all the bad stuff that happened to her that route, and her response is to tell him to leave, then chase him off when he tries to get rid of Toyotomi. Presumably, he goes right back to raping her once Takuya is driven off, with Takuya returning only after she’s committed suicide.]]
* InferredHolocaust: [[spoiler:Ayumi’s route strongly implies that Mio was trapped beneath Triangle Mountain just like in her own route. By the apparent mechanics of the Reflector and alternate dimensions, this means that Mio probably dies beneath Triangle Mountain in every route apart from her own.[[NoEndorHolocaust But hey, Mio does technically have an escape route so long as she doesn’t give up… right?]]]]

* ValuesDissonance: Takuya's pervy, borderline creepy behavior towards the female cast might come off as very off-putting today (especially in the remake where it hasn't been toned down one bit) but it was actually a very common protagonist archetype for visual novels in 1996, since most visual novels at that time were PornWithoutPlot. Though unlike plenty of other examples from back then, Takuya was explicitly a generally good kid prior to his father dying, and his pervy, creepy behaviour is him trying to cope. It helps that the women he does it to either don't even give him attention for it, clearly pity him, or give him back just as good as he gives.

* UnintentionallyUnsympathetic: Yuuki, due to his treatment of Mio. On the surface, he cares for her, with his fawning over and accompanying her more than Takuya, but once you hear his interactions towards Mio’s love of archeology (of which she has dozens of notes on), he loses that sympathy. The reason? He clearly doesn’t give a single shit about it, as every time he blows her off (in a way that makes it clear he wasn’t even listening), and tries to convince her to do something else when she’s doing something involved with it[[note]]while she does often comment that Takuya would know what to do because his father was an archeologist and passed down some knowledge, she doesn’t know Yuuki is in love with her, so it’s purely innocent on her part[[/note]] nor consider learning about it so they can do it together. Even worse, Mio’s route has [[spoiler:him reveal something Mio told *Takuya* in confidence to the whole school, purely because Mio did something with Takuya instead of him]]. The more you see them together, the more you realize he sees her not as a potential girlfriend, but a prize to be won.

** This game has influenced so many later visual novels that it is not seen quite as groundbreaking by most modern people. It's the first or one of the first in the medium to feature [[DoorStopper an epic-scale plot]], and the [[JigsawPuzzlePlot "multiple route mystery"]] structure, among others. In western countries, this is furthered by the fact that the game [[LateExportForYou didn't receive a translation until 2011]], long after the "imitators". One way this manifests itself is that in the Japanese visual novel database site Erogamescape, made largely of the original audience, it's rated much higher (at or near the top) than by Western visual novel readers at VNDB, though it has gotten some newfound appreciation after the remake got localized.
** The Visual Novel was released in 1996, ''well'' before the [[StockLightNovelHero Isekai trend]] began in TheNewTens. However, the anime adaptation had the misfortune of airing in 2019, right when that fad was at its peak. Thus, some viewers who were thoroughly impressed with the Time Travel/Alternate Timeline thriller of the first half were puzzled and annoyed by the fact that the story suddenly shifted into yet another Isekai by the second half.