History DiegeticSoundtrackUsage / AnimeAndManga

* Episode 7 of season 2 of ''Manga/TheDangersInMyHeart'' anime starts with the main characters at a karaoke party. Ichikawa starts off-key singing the 2nd opening song, which segues into the opening itself.

** And other OP's and EP's have been used as BackgroundMusic too, but most of the time this is lost in the dubs.

* Episode 7 of the season 2 of the ''Manga/TheDangersInMyHeart'' anime starts with the main characters in a karaoke party. Ichikawa starts off-key singing the opening song, which segues into the opening itself.

* Episode 7 of the season 2 of the "Manga/TheDangersInMyHeart" anime starts with the main characters in a karaoke party. Ichikawa starts off-key singing the opening song, which segues into the opening itself.

* The ''Anime/{{Patlabor}}'' {{OAV}}s have their own theme song playing on a TV channel as the off-duty crew flip through the channels looking for something to watch. Ohta even says to flip back to it after Asuma goes past it a second time.

* Taken to ridiculous levels in ''Manga/HimechanNoRibon''. Apparently, "Egao no Genki" (the series' opening) and the band that performs it, SMAP, is extremely popular in Hime-chan's world -- in one episode, Hime-chan pretends to have invited SMAP to a school event to save the drama club's reputation by turning into the band members and walking out on stage one at a time, there was almost a scandal when Hibino was caught hugging Hime-chan disguised as one of the band members, and the song pops up all over the place.

** Botamon and Kari say hello in ''Anime/DigimonAdventurePilot'''s [[Anime/DigimonTheMovie English dub]] by playing the opening theme notes in a call-and-response style (using Botamon's bubble blowing and Kari's whistle).

* ''Manga/ZatchBell'' starts playing the first theme almost any time the main characters reveal a new FinishingMove. And dozens of other times as well.
** The first episode with Apollo shows him playing the opening theme for children on a flute-like instrument.

** In episode 9/14 ("Someday in the Rain"; see AnachronicOrder), Haruhi sings a snippet of the show's ending theme while undressing Mikuru. Don't ask.

* The music Kousei is transcribing in the first episode of ''Manga/YourLieInApril'' is the first opening song, [[https://www.youtube.com/watch?v=SnXkhkEvNIM Hikaru Nara by Goose House]].

* Although these were removed from the dub of ''Anime/{{Hamtaro}}'', the Japanese episodes contain a lot of them. If the characters are going to sing a song, it's probably the opening theme (though it's generally changed to the recurring "remember I'm your ham" song in English.) This happens as early as the first episode, when Hamtaro, Boss, and Oxnard are singing to Bijou. The second movie even [[spoiler:has Hamtaro play the theme tune on a magic flute in order to defeat the villain]].

* ''Manga/TokyoMewMew'' also has one of its theme songs as a cell phone ring, and one episode involves two characters bonding over the song and making plans to go to the artist's concert.

** In ''Anime/SmilePrettyCure'', a instrumental, slow version of Yay! Yay! Yay! is BackgroundMusic.
** In ''Anime/PrettyCureAllStars: Spring Carnival'', [[Anime/DokiDokiPrettyCure Mana]] belts out her show's theme song to show off her singing chops. Too bad she's HollywoodToneDeaf and she causes the rest of the Cures to cover their ears in horror.

* In Episode 13 of ''Anime/MayoChiki'' Usami is humming the opening theme.

* ''LightNovel/NyarukoCrawlingWithLove'':

* Although it's not the show's theme tune, the anime ''LightNovel/FullMetalPanic'' regularly uses a variation of the theme song from ''Series/TheATeam'' as BackgroundMusic. In the follow-up series ''Anime/FullMetalPanicFumoffu'', the song is also used as the main character's cellphone ringtone, and one other character remarks how it sounds "just like the theme song of one of those old American TV series".

* ''LightNovel/HaruhiSuzumiya'':

** Ryoko hums the opening of season 1 of the main series while cutting vegetables in ''Manga/TheDisappearanceOfNagatoYukiChan''.

* Two in a row in the second season of the ''LightNovel/LogHorizon'' anime:

** In episode 24, Minoru is interrupted by his ringtone, which is [[Creator/MinoruShiraishi his voice actor's]] parody version of "Koi no Mikuru Densetsu" from ''LightNovel/HaruhiSuzumiya'' (which was used as the ending theme for episode 15).

* The HotSpringsEpisode in ''Anime/{{Maburaho}}'' has Kuriko listening to the theme song on her portable music device on the train.

* In episode 8 of ''LightNovel/{{Slayers}} Evolution-R'', a scene opens up with Gourry humming along to the soundtrack, only to be scolded by Xelgadis.

** After a particular [[StatusQuoIsGod denial of a normal body]] for Ranma, he closes the episode in girl form, sadly singing the refrain to that season's end theme: "Don't cry, China Boy..."

* In Episode 9 of ''Manga/FoodWars'' both Soma and Erina are humming the ending song "Spice" as he is heading to the baths and she is already bathing. While Erina is very well in tune, Soma is comically humming it [[HollywoodToneDeaf out of tune]].

* ''Anime/HellGirl'' has used at least two of its themes as ringtones. Also noteworthy: [=SNoW=], who sings the OP of seasons one and two, has a cameo on an advertisement at the end of ''Futakomori'''s theme.