''ItoJunjiNoNekoNikki'', also known as ''Cat Diary: Yon and Muu'' (猫日記 よん&むー ''Neko Nikki Yon to Mū''), is a manga by famous horror manga author JunjiIto and his daily life with his fiancée's cats.

Drawn in his usual style used for his previous works like ''Manga/{{Gyo}}'' and ''Manga/{{Uzumaki}}'', this manga is actually comedy, but with similar visual effects of his earlier works for comedy value.

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!!This series provides examples of:

* AffectionateParody: Of Ito's own work as a horror mangaka.
* ArtStyleDissonance
* AuthorAvatar: Mr. J is Junji Ito himself.
* CatsAreMean: Subverted, or played straight, depending on your point of view.
* CatScare
* CloudCuckooLander: Mr. J and A-ko chan.
* ComicalOverreacting: The usual source of the NightmareFace ala Junji Ito in this manga.
* CutenessProximity: With a healthy dose of NightmareFace.
* DoesThisRemindYouOfAnything: Despite polar opposite art-styles, the humor is quite similar to ''HyperboleAndAHalf'', in part because they're based in the personal stories of the artist.
* EverythingsBetterWithSparkles: Subverted; Yon sneezes all over the floor, creating pretty yet disgusting sparkles.
* FaceOfAThug: Yon is basically the cat version of this trope. Mr. J is scared of his face even before seeing the skull-like markings on his back. He's actually quite affectionate.
* FourIsDeath: The cat with the death's head markings is known as Yon, which is the AlternateCharacterReading of the kanji for the number 4, "shi" that's used because the latter sounds like the word for death. The name could be a sort of VisualPun.
* GilliganCut: "That accursed cat is coming to my house?! I won't accept this! I won't accept this!" Cut to Mr. J building the cat tower.
* HeAlsoDid: JunjiIto is known mostly for his horror stories, like ''Manga/{{Gyo}}'' and ''Manga/{{Uzumaki}}''.
* {{Iyashikei}}: Aside from the spooky art style, this is really a comic about a [[HappilyMarried Happily Engaged]] couple doting on their cats. One of the most dramatic incidents is when Yon runs away, [[spoiler:which is resolved when he's found at the plumbers' warehouse and the nice folks who work there help catch him]]. It's basically about nice people and cute cats.
* JournalComic
* KindheartedCatLover: Pretty much every human character.
* LighterAndSofter: Compared to the rest of his works.
* MarkOfTheBeast: Yon's markings on his back look like a skull. This troubled Mr. J in the manga before he grew fond of him.
* MundaneMadeAwesome: Cat Wand Battle!!
* NightmareFace: A-ko, J's wife: no irises, and ALWAYS smiling. Once in a while, J makes one too.
* NonhumansLackAttributes: Averted; the cats have assholes.
* PlayingAgainstType: This series compared to the rest of his work.
* ReallyDeadMontage: [[spoiler:Subverted]].
* RidiculouslyCuteCritter: Muu.
* SliceOfLife
* TearsOfJoy: Mr. J when Muu sleeps next to him. [[spoiler:Except it's not really Muu, it's just his bedding.]]
* TenderTears: Mr. J, every couple chapters.
* ToiletHumor: Mr. J buys a plastic poop.
* TraumaInducedAmnesia: [[spoiler:Muu, after being neutered]].
* WhatMeasureIsANonCute: Mr J initially wants nothing to do with Yon, who's not very cute no matter which way you look at him, but he gradually warms up to him.
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