[[caption-width-right:320: The death and mutilation of innocence. A synopsis.]]

Guy dates girl. Girl gets in a car accident and is left in a coma. Girl's best friend eventually gets guy to get over his own misery then starts going out with him herself. Girl ''finally'' wakes up from coma after [[ArcWords three years]]. Drama ensues. Has a sequel of sorts in the form of the ''Franchise/MuvLuv'' series.

''Kimi ga Nozomu Eien'' (君が望む永遠, lit. The Eternity You Desire), also known in the Anglo-phonic world as ''Rumbling Hearts'', is a visual novel and anime series that depicts an abrupt and tumultuous transition from an idyllic lifestyle to that of unadulterated sorrow and tragedy.

Released in 2001 as a visual novel, it was later picked up and turned into a 14-episode anime series that was initially broadcasted from October 2003 to January 2004. In both manifestations, the protagonist, a third year high school student by the name of Takayuki Narumi, begins dating fellow classmate and introvert Haruka Suzumiya after much convincing from their mutual friend, Mitsuki Hayase, a talented swimmer who secretly harbors her own feelings toward Takayuki but attempts to suppress them in favor of her insecure and timid friend's happiness. Things seem to go blissfully well for the couple until wholly unanticipated disaster, in the form of a severe car accident, renders Haruka comatose and Takayuki guilty and psychologically decimated. Shortly thereafter, Takayuki's life proceeds to deteriorate at a rapid rate, eventually stifled by the personal intervention of Mitsuki Hayase, who definitively discards her promising career as a nationally-renowned swimmer to help Takayuki recover from his PTSD. Eventually, things return to a relatively balanced state, with both Takayuki and Mitsuki having become lovers and having largely transcended the drama surrounding the comatose Haruka from earlier (though through a somewhat shameless repression of her memory). However, once Haruka wakes from her coma after three years of purgatorial slumber, the bittersweet life that both Takayuki and Mitsuki mutually built for themselves, like its more effervescent predecessor, swiftly crumbles.

For those who seek an upbeat anime series with hijinks and the works, ''Rumbling Hearts'' is the complete antithesis to that genre, with the only "comedic relief" in the show being two of Takayuki's teenage co-workers, who, in all sincerity, seem grossly out of place within the framework of the cruel and melancholic plot.

This tragic and excruciatingly realistic story of decaying innocence and transient love somehow gave birth to the Franchise/MuvLuv franchise, a series of visual novels centered around mecha and [[Anime/NeonGenesisEvangelion Evangelion-style]] alien onslaught. During Anime Expo 2016, Degica announced that an English localization of this visual novel was in the works.
!!''Rumbling Hearts'' provides examples of:

* TheAnimeOfTheGame: Originally based off of an [[BleachedUnderpants H-Game.]]
* ArcWords: Three years.
* BittersweetEnding: [[spoiler:(Mitsuki's route, which was followed by the TV adaptation): In the end, Haruka decides she can't be with Takayuki because he's not the same person he was three years ago; Takayuki finds Mitsuki and convinces her not to leave, and says he won't see Haruka again. It then skips to the first children's book Haruka wrote, about a character who just wants to get to the top of a hill to see her friends once more. The last shot is of Haruka standing in front of the tree, hopefully waiting.]]
** [[spoiler:And even when they're together, Takayuki has foregone his chance for a better full-time job, while Mitsuki not only couldn't get back to her swimming career she abandoned long ago, she also lost her Office Lady job. But at least they're together.]]
*** [[spoiler: The OVA "second season" which follows a Haruka route ends with Takayuki and Haruka renewing their relationship and love for one another in the same spot where her traumatic accident occurs and in an almost sickeningly sweet TastesLikeDiabetes moment of all the onlookers clapping on for them. However, Mitsuki, who has almost been DemotedToExtra in this continuity, gave up her swimming career and [[DidNotGetTheGirl didn't even get Takayuki either.]] But she and Haruka maintain their friendship as she willingly bows out of the LoveTriangle.]]
* BreakTheCutie
* TheCameo[=/=]MarthDebutedInSmashBros: The adaptation has the first animated appearances of Yayoi Isumi (Takayuki's landlady, originally from age's debut title ''Kimi Ga Ita Kisetsu'') and Chizuru Sakaki (Akane's rival and best friend, originally from the quasi-sequel ''Franchise/MuvLuv'').
* CatchPhrase: Ayu's "You can go step in cat crap!"
* CuteLittleFangs: Ayu, one of the waitresses in the restaurant Takayuki works at.
* {{Deconstruction}} : Of the very concept of TrueCompanions by showing just how impermanent the bonds of childhood/ adolescent friendship truly are, especially in the face of major, life altering experiences. It also shows how trying to keep up the pretense after the bonds fade can only make things worse.
* DemotedToExtra: If you only see the anime, you wouldn't notice that some extras like ''the doctor'' or some of her assistants, and Mayu/Ayu can be love interests.
* EvolvingCredits: The series doesn't have the normal opening until the third episode, when the main story takes place.
* GutPunch: Especially in the VisualNovel, but the anime also doesn't let up. [[MemeticMutation Can't spell "rage" without "age"]], indeed.
* HalfTruth: ''Everyone'' with respect to Haruka after she wakes up.
* HeroicBSOD: Takayuki, after the accident. He stays that way until Mitsuki finally snaps him out of it.
* ICouldaBeenAContender: Hayase Mitsuki, a once-in-a-generation swimming prodigy, has the makings of an Olympic-Grade Champion. [[spoiler:She leaves it behind to take care of her best friend Haruka's boyfriend Takayuki, so suicidally depressed over Haruka's car-accident induced coma (which Mitsuki blames herself for) that he could not finish high school, and ends up with Takayuki herself. Three years later when Haruka awakens, Takayuki flirts on the edge of leaving Mitsuki. Adding insult to injury, Mitsuki (now a mere office lady) meets an old rival who is now an Olympic-level champion swimmer herself, doubly reminding her of the [[SenselessSacrifice meaninglessness of her sacrifice]]. And to make matters worse, once she reveals what she did to the awakened Haruka, Haruka did NOT take it well and drove her away, destroying their friendship and really leaving Mitsuki with literally ''nothing''.]]
* IfYouEverDoAnythingToHurtHer: Mitsuki says this to Takayuki regarding Haruka.
* LockedOutOfTheLoop: See HalfTruth above.
** Also Akane. Did her parents even bother to tell her that "Takayuki won't be seeing her anymore, since we told him to stop coming"? Nope, hence the incredibly painful to watch scene where Akane tells both of them off for not coming to visit (in the latter case, Mitsuki actually wanted to visit but was called a traitor by Akane herself).
* LoveTriangle: Between the newly awakened Haruka, Mitsuki, and Takayuki.
* MarketBasedTitle: ''Rumbling Hearts'' is the official title for the North American release of the anime, and also the title of the opening theme for the original visual novel. The Japanese name for the series is ''Kimi ga Nozomu Eien'' (The Eternity You Desire).
* MatchmakerCrush
* MessOfWoe: Happens to Takayuki after Haruka falls into coma. If it weren't for Mitsuki, his place would have been even worse off.
* MoodWhiplash: The anime may be really sad and such... but the Omake in the end? REALLY lighthearted in comparison.
* {{Omake}}: Instead of a next episode preview, there's an omake at the end of each episode.
* OneSideOfTheStory: Akane, when she walks in on [[spoiler:Mitsuki in Takayuki's bed - without knowing that her parents had just told him to leave, or that Mitsuki offering herself to him might have been the only thing that kept him from going off the deep end forever.]]
** This is an endless source of DramaticIrony, since Akane is always out of the loop, making some scenes with Akane just painful.
* PlotInducedStupidity: Both straight and justified. A doctor treating TBI (Traumatic Brain Injury) by demanding that everyone play along with a false reality? It speaks volumes that the same doctor frequently smokes in the hospital... ''near oxygen''. On the other hand, there are several points of the story where characters do unbelievably stupid things that are [[JustifiedTrope completely consistent with their individual pathologies]].
* PoorCommunicationKills: Haruka's parents and the doctor ''might'' have had second thoughts about what they were asking of Takayuki if they knew about his relationship with Mitsuki.
* RunningGag: Haruka getting involved in a vehicle accident carries over to age's other works like VisualNovel/MuvLuvAlternative and Ayu-Mayu Theater.
* ShownTheirWork: The producers of the anime series did their research on PTSD as it applies to Takayuki, and it shows.
* TaremeEyes:
** Haruka and Mitsuki contrast each other as the two main love interests, with the former being softer and the latter more tomboyish and high-spirited.
** Mayu and Ayu shows the same contrast as well, where Mayu is more traditionally cute and Ayu shows a {{tsundere}}-like behaviour.
* ThemeTuneCameo: Mitsuki hums the opening at the beginning of Episode 8.
* ThoseTwoGuys: Ayu and Mayu, the two waitresses who Takayuki works with at the Sky Temple family restaurant.
* {{Time Skip}}: Haruka is in a coma for many years after the car crash. Drama ensues.
* TrueCompanions: [[DeconstructedTrope Deconstructed]] as Takayuki and Mitsuki's devotion to Haruka takes '''huge''' tolls on the three.
* {{Utsuge}}
* {{Who Wants To Live Forever}}: Referenced in Mayal's Gift in the final episode.
* WriterOnBoard: The doctor's [[IdiotBall plan to help Haruka]] [[spoiler:by having everyone pretend no time has elapsed]] might have passed for simple carelessness... if they hadn't done such a painfully-accurate portrayal of the effects of [[ShellShockedVeteran PTSD.]]