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Takeshi Oomura is [[BlessedWithSuck no stranger to bad luck]]. Three days ago, though, his [[FromBadToWorse misfortunes seem to be piling up]]. He gets chased by dogs, seen his house burn down... and dies from a fatal concussion. "Fourteen years of life... my life was too short."

Luckily, Heaven seems to think so too: upon dying he meets an angel called Elle who immediately [[DeathIsCheap resurrects him]]. Elle explains that [[DisappearedDad Takeshi's father]] had passed down his role to his son -- essentially, Takeshi is now [[BlessedWithSuck the holder of all the bad luck in the world]], and Elle was sent to become his guardian angel. [[SarcasmMode Whoop-dee-doo]].

Of course, Takeshi wants to refuse, so he seizes the opportunity to pass the curse to someone else. Except his curse is going to affect an innocent little girl, so [[JerkWithAHeartOfGold he decides to accept it himself]]. Elle acknowledges his acceptance and then transforms into a human, after which she explains that she has to be near Takeshi 24/7 so she can supply him with good luck. Takeshi isn't particularly happy with this arrangement.

A manga by Kenjirou Takeshita, ''Happy World!'' is a weird mix of {{Ecchi}}, Magical Girlfriend, Supernatural Horror and School Comedy. Though the tone shifts often, and it manages to incorporate some very thoughtful pieces on parenthood and [[ContemplateOurNavels life in general]]. There is also an OVA adaptation done by Creator/{{ZEXCS}} and Creator/{{KSS}}.

!!Tropes contained:

%%* ArtEvolution: Quite a bit. For comparison, here's Takeshi and Elle as seen in chapter 1. Here they are again in chapter 59.
%%* BetaCouple: Maruyama and Kusakabe.
* BrotherSisterIncest: The explanation Takeshi uses to explain Elle's connection to him is that she's his step-sister. Cut to Takeshi exclaiming loudly to her in a classroom [[ItMakesSenseInContext "We should make a baby."]] And they actually go halfway through the act before realizing that they're not emotionally ready for it. [[spoiler: As it turns out, their relationship to each other is actually more than even step-siblings...probably. Though the two were born in different ways, Takashi and Elle share a mother. Oddly, the implications are never discussed.]]
* CerebusSyndrome: The first 20-odd chapters are a pretty normal for a supernatural romantic comedy. When Isra appears, though, things start getting dark ''REALLY'' fast.
* CharacterizationMarchesOn: At first, there appears to be no special significance to [[spoiler: Isra's crown]], and she's shown putting it on nonchalantly in her first appearance. [[spoiler: Later, it turns out that the crown is a PowerLimiter placed on her by her mother, and that removing it from her head is a very bad thing.]]
* ContinuityCreep: This sets in around the same time as the CerebusSyndrome, switching from a more episodic format to an ongoing story.
* DeathIsCheap: Elle resurrects Takeshi day in and day out. However, this constant use of her powers ends up [[spoiler:killing her child]]. But luckily she's [[spoiler:OnlyMostlyDead... It turns out that the soul of the child was split between Takeshi and Elle.]]
* EnfantTerrible: Hikaru's little sister Michiru is a child genius who spends all of her time torturing her older sister. Not just sibling rivalry, but CIA level torture. Takeshi ends up taking her place because he can be resurrected.
* HalfHumanHybrid: [[spoiler: Takeshi is revealed to be half-angel, and the Hoshino sisters turn out to be half-demon.]]
* HarshWordImpact: A rather squicky version of this happens in chapter 10. After Takeshi and his male classmates conspire to peep on the girls during their physical exam, Elle (who's oblivious to these plans), cutely tells Takeshi that she's embarrassed about the prospect of her breasts being seen. The force of her speech bubble momentarily ''slices Takeshi in half'', and his innards are visible.
* HaveYouSeenMyGod: Any angel that wants to get promoted has to accept [[spoiler: that God is currently missing in action]].
* HornyDevils: Isra explains that demons draw nourishment from humans by draining their "genki". It's never explicitly stated what "genki" refers to, but it's heavily implied to be sexual energy or the like since the humans are rendered naked after being fed on and both Elle and Isra become flustered when Takeshi asks them what genki is.
%%* HugeGuyTinyGirl: Maruyama and Kusakabe.
%%* IllGirl: Yuria Kusakabe.
* InfantImmortality: [[spoiler: Double subverted. Elle has a one-parent child named Prayer who requires a constant flow of light energy from her to survive. When Elle uses up too much of her power to resurrect Takeshi, this ends up killing Prayer. However, Prayer's soul survives within both Elle and Takashi, allowing her to be resurrected later.]]
%%* TheLegionsOfHell: Demons are scary.
%%* LovableSexManiac: Takeshi's cousin Motoko, one of the increasingly common female versions.
* LukeIAmYourFather: [[spoiler: Multiple times. As it turns out, Elle's mother was also Takeshi's mother, and the demon Isra is Elle's twin sister. Inverted with Sanae and Motoko, who are revealed to be stepmother and stepdaughter respectively.]]
* MadeOfIron: Due to his bad luck, Takeshi is able to take a punch to the face without flinching.
%%* MagicalGirlfriend: Elle
* MoodWhiplash: There is nothing "Happy" about showing a smiling innocent girl, and have the next panel reveal her empty shirt now riddled with bullet holes. And then there's the part about what happened to [[spoiler: Elle]]'s mother...
* NotSoHarmless: Isra is at first portrayed as a StarterVillain, and is driven off by Elle with relative ease. Much later, however... [[spoiler: it turns out that she's powerful enough to bring about the end times. And nearly does]].
%%* OneGenderRace: Angels.
%%* ParentalAbandonment: One of the various ways in which Takeshi is unlucky.
%%* {{Reincarnation}}: [[spoiler: The last chapter explains it fairly well.]]
* TournamentArc: A demon convinces the Hikaru's father and sister to kidnap Takeshi in order to force Elle, Hikaru, Sanae and [[LovableSexManiac Motoko]] to fight in one of these to get him back.
* TriangleRelations: Elle wants Takeshi's child. Hikaru wants to marry him. When he suggests that those goals aren't mutually incompatible, they don't take it well.
* TrulySingleParent: The angels, and they can each only have one child. [[spoiler: Usually...]]
%%* UnluckyChildhoodFriend: Hikaru Hoshino
* ShoutOut: In chapter 35, [[ShortTank Hikaru]] dresses like a [[{{Ninja}} Kunoichi]] and dons a [[Franchise/{{Naruto}} Konohagakure]] [[{{Hachimaki}} headband]].