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Ema Hinata's father has decided to remarry a woman named Miwa Asahina. When she goes to move into the Sunrise Apartments, she meets her new brothers: All 13 of them!

''Brothers Conflict'' began as a series of novels, divided into two cours: the first one is set when Ema is in high school, while the second has Ema entering into university. It has been adapted into two otome games by Otomate: ''Brothers Conflict: Passion Pink'' and ''Brothers Conflict: Brilliant Blue'', each one featuring a set of seven brothers (''Brilliant Blue'' features six brothers and a SecretCharacter) An anime by Creator/BrainsBase started airing as part of the [[Summer2013Anime Summer 2013 Season]].

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!!Tropes:

* AcademicAthlete: Subaru attends the Meiji University and is in the basketball team; because he dedicated his whole life to absolutly nothing but sports, he has no clue about how to deal with Ema, having no experiences with women at all.
* AlternateRealityEpisode: The otome game is basically this: What would have happened if Ema had fallen in love with one of the Asahina brothers?
* ArrangedMarriage: Masaomi was going through this in the books. However, he politely declined the arrangement. Why? [[CrowningMomentOfHeartwarming Because he promised Ema that he would be by her side.]]
* AttemptedRape: [[spoiler: In episode 10 of the anime, Fuuto was about to rape a sleeping Ema, because in his words, "You [Ema] belong to me." Thankfully,he doesn't go through with it, because he realizes that he truly loves her.]]
* BabiesEverAfter: [[spoiler:Masaomi's ending.]]
* BeautyMark: Natsume has one on the chin, the twins have one next to one of their eyes.
* {{Bishonen}}: Ema's step-siblings are all pretty boys.
** CastFullOfPrettyBoys
* CharacterDevelopment: Because of Ema's influence, all of the Asahina brothers have changed or matured dramatically. Although, how much development each one gets depends on whose route is chosen.
* DisappearedDad: What happened to the Asahina brother's birth father? Do they even have the same one?
* DoItYourselfThemeTune: The anime ending is sung by the boys and Juli's seiyuus.
* DumpThemAll: [[spoiler:All she ever wanted was to have a family, and towards the end of the first season she finally made it clear. How effective that act was, however, is another question altogether.]]
* EverybodyIsSingle
* FlirtyStepSiblings
* FreudianTrio: The triplets: Natusme is the Superego, Azusa is the Ego, and Tsubaki is the Id.
* HappilyMarried:
** Rintaoru Hinata and Miwa Asahina.
** [[spoiler: Ema's birth parents: Kenji and Yukie Nagami.]]
** [[spoiler: Masaomi and Ema in Masaomi's ending.]]
* HeroicBSOD: [[spoiler:Ema has one upon learning that she's adopted.]]
* HouseHusband: Ukyo acts as the mother figure to the family.
* HugeGuyTinyGirl: Ema is this with one of the taller, muscular brothers in a different route: Kaname, Subaru, Natsume, and Ukyo.
* IdolSinger: Fuuto is this, and he's also quite popular.
* IncestSubtext: Of the {{Twincest}} variety. Reminiscent of ''OuranHighSchoolHostClub'''s Hikaru and Kaoru. Tsubaki and Azusa practice extremely intimate lines with each other for their voice acting jobs without a care in the world. When Ema hears them she gets quite flustered. They don't even really bother correcting her. Also very gentle with each other outside the studio.
* {{Jerkass}}: Ukyo's ex-girlfriend, Reiko Amamiya, only dated him to get closer to his mother and didn't care about him at all.
* LookalikeLovers: {{Inverted}}. In Ukyo's route, Ema (new love interest) looks like his ex-girlfriend, Reiko.
* MakingLoveInAllTheWrongPlaces: [[spoiler: In Kaname's route, it's heavily implied that he and Ema had sex in his car at night.]]
* MassiveNumberedSiblings: Ema now has ''thriteen'' stepbrothers.
* MayDecemberRomance: In the games, if the player decides to pair Ema with any of the older brothers. Also the other way around if she's paired with the 10 year old Wataru.
* TheNicknamer: Juli and Rui call Ema "Chii".
* NotBloodSiblings: The whole point. [[spoiler:Doubly so once Ema finds out that she's adopted.]]
* NunTooHoly: Kaname is not a very good Buddhist monk.
* PeekABangs: The identical twins Azusa and Tsubaki have specular bangs covering one of their eyes.
* RapunzelHair: Hikaru, and [[spoiler:Yukie Nagami (Ema's birth mother).]]
* SecondLove: [[spoiler:Ema is this in Iori's route.]]
* SecondaryCharacterTitle: While Ema is the main protagonist, the "Brothers" in ''Brothers Conflict'' refers to her 13 stepbrothers.
* {{Seiyuu}}: Two of the three triplets, Azusa and Tsubaki, in-universe.
* SiblingRivalry: Yusuke vs Fuuto and Tsubaki vs Azusa. To be honest, except for the otome game, where the player can choose one of the brother's route, the Asahina brothers are all "love" rivals for Ema. And even in the games all of the brothers have feelings for her, they just don't act on them as much.
* SpeaksFluentAnimal: Ema talks with Juli, her pet squirrel, all the time. Later we find out that [[spoiler:Rui, or "Luis", is also able to do that]].
* StrongFamilyResemblance: ''Averted''. The Asahina brothers barely resemble each other at all, even the triplets. [[spoiler:Though in Louis' case it's justified as he is HappilyAdopted]].
* TheirFirstTime: Ema has her "first" with a few of the brothers in their routes. They are [[spoiler: Tsubaki, Kaname, Masaomi, and Hikaru.]]
* TitleDrop: Brothers Conflict is the name of Hikaru's chart detailing the chances each of the 13 brothers have with Ema.
* TokenMiniMoe: Wataru, of course.
* WholesomeCrossdresser: Hikaru, his crossdressing was so good, it made Ema think he was really female.

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