History Manga / SleepyPrincessInTheDemonCastle

* IdenticalStranger: As shown by Succyun and Incyun, the Succubus family all look practically identical to members of the Goodereste family, in particular Succyun looking like the Princess and Incyun looking like the King. Though based on those two, each of them are an OddballDoppleganger, being nothing like their respective royal member in personality.

* ForcedSleep: At one point, the princess casts a high level sleep spell, only for it to knock out everyone in the castle ''[[NoSelfBuffs except]]'' her.

* NoOSHACompliance: The demon castle is designed akin to levels from a video game and as one would expect is very hazardous, with extremely high walkways that have nothing to keep people from falling off them, and giant '''lava pits''' that serve no purpose. The old demon castle ruled by Hades is even more dangerous thanks, being full of lava and a number of death traps. Even the demons, who don't object to the harzards in their own castle, point that the old demon castle is dangerous.

* ForWantOfANail: Chapter 200 has Alazif coming down with Grimoire Rhinitis, which causes him to TimeTravel with Princess and Cursed Musician whenever he sneezes. After the second sneeze, he brings them to an AlternateTimeline where, due to the Princess stealing his special futon that Demon Cleric gave him, the Demon King decided that it meant he needed to grow up and be independent, resulting in him bringing about massive changes to the Demon Army, starting with kicking out the weakest demons such as Demon Cleric and Harpy. In order to fix things in Chapter 203, the princess not only returns the futon, but also explains that the Demon King is not alone in caring greatly for Demon Cleric, making the young king stop thinking about changing things.

** The members of the Goodereste family have names relating to sleeping. While the given names for the three revealed so far are the same (Aurora for the Princess, her mother, and her aunt), their middle names are most notable. The Princess is S(u)ya Lis, the equivalent of the "ZZZ" onomotopoeia, referencing her frequent attempts to sleep, her mother is Nem(u) Lis, which literally translates to "sleep", and her aunt is Coma Lis, referencing how she frequently enters a coma-like sleep that requires great effort to wake her up.

[[{{JustForFun/IThoughtItMeant}} Has nothing to do with]] ''[[Anime/DragonBallSleepingPrincessInDevilsCastle Sleeping Princess in Devil's Castle]]'', the second NonSerialMovie in the ''Franchise/DragonBall'' franchise.

* GoodAngelBadAngel: Happens to the Princess when she becomes torn between Quilladillo's health, and she doesn't want him to get sick due to being overweight, yet still wants him to have a springy tummy that she can sleep on.

* SpringtimeForHitler: In Chapter 24, it is revealed that the reason why the demons leave precious and powerful magical items in easy to access areas is because [[TheOnlyOneAllowedToDefeatYou the Demon King wants to be the one to kill the hero himself]], thus he wants to give the hero the edge against his bosses and flunkies. Unfortunately, [[NiceJobBreakingItHero almost all of the artifacts are either stolen or destroyed by the Princess before the hero ever gets to them]], prolonging his quest unintentionally.

* CameBackWrong: Chapter 214 starts off with a sudden exponential increase in Princess deaths, heavily tiring out Demon Cleric in the process. By the end of it he's so tired he leaves the Princess dead for longer than usual, which results in his regular revival bringing her back as a zombie, complete with a desire to eat brains and displaying various zombie-based behaviors, all while she tries to use this as an excuse to sleep like a zombie. In the process of trying to experience zombie sleep, she almost causes a Teddy Demon ZombieApocalypse before Demon Cleric finally gets things under control and returns everybody to normal.

* RidiculouslyCuteCritter: The Teddy Demons.

* WriteWhoYouKnow: In-Universe. Chapter 212, which serves as an advertisement for the anime adaptation, involves the production of an anime series about the events of the Demon Castle, with Twilight and Great Red Syberian wanting everyone to act natural as a camera films footage for reference material. Unfortunately, almost everyone else hams its up when the camera rolls, with the only one who acting natural (and thus having usable footage) being the Princess (which results in the series being about her rampages throughout the castle before she goes to sleep).

* WriteWhoYouKnow: Chapter 212, which serves as an advertisement for the anime adaptation, involves the production of an anime series about the events of the Demon Castle, with Twilight and Great Red Syberian wanting everyone to act natural as a camera films footage for reference material. Unfortunately, almost everyone else hams its up when the camera rolls, with the only one who acting natural (and thus having usable footage) being the Princess (which results in the series being about her rampages throughout the castle before she goes to sleep).

* FountainOfYouth: The Princess stumbles on one while looking for something to make her smaller, and it temporarily turns her into a kid. When she tries to replicate the effect, she inadvertently turns all the demons in the castle into kids instead.

** Former Demon King Midnight grows as he accumulates magical energy, and is giant-sized until [[spoiler: the stored up mana ends up getting sucked away thanks to Alazif's Grimoire Rhinitis (and the TimeTravel adventure the Princess and the Cursed Musician have become of it).

** Former Demon King Midnight grows as he accumulates magical energy, and is currently giant-sized.

* HornyDevils: There is at least one succubus, but they don't feed with sex, per se. They feed on human vitality, and survive by being popular.

* BoxAndStickTrap: The Demon King uses variation of one using a steel cage to recapture the Princess after an escape attempt (because she wanted to go shopping in the human realm). There was a futon inside the trap, and it closed when she fluffed the pillow.