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'''''Diamond no Ace''''' (ダイヤのA), or, in English, ''[[PunBasedTitle Ace of Diamond]]''[[note]]Exactly as written on screen. A more natural translation would be "Ace of the Diamond", which is used for the Crunchyroll simulcast.[[/note]] is a shōnen baseball manga written and illustrated by Yūji Terajima and published by Kodansha. It has been serialized by Weekly Shōnen Magazine since 2006. In 2008, Ace of Diamond received the Shogakukan Manga Awards for the shōnen category. In 2010, it won the Kodansha Manga Award for best shōnen manga.

Sawamura Eijun is pitcher from rural school Akagi Junior High, where the school's baseball team was [[{{Understatement}} fairly bad]][[note]]To be exact, they never won[[/note]]. Despite this, Sawamura thoroughly enjoyed playing with his teammates, and was dead set on entering high school with them and continuing their journey to Koushien there. However, he's scouted by a manager from an elite private school in Tokyo. After some deliberation and encouragement from his junior high teammates, he decides to carry their dreams with him as he moves to Tokyo to join Seidou High School's powerhouse baseball team. Unfortunately for him though, what he finds there isn't quite what he expected...

[[http://www.animenewsnetwork.com/news/2013-05-10/studios-madhouse-ig-make-ace-of-diamond-anime An Anime adaptation]] by {{Creator/Madhouse}} and Creator/ProductionIG has premiered as part of the [[Fall2013Anime fall season]].

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!! This series contains examples of:
* TheAce: Seidou has no "true" ace, and the ace number is the ultimate goal for Tanba, Furuya, Sawamura, and Kawakami; as they are the four first-string pitchers, and the ultimate premise of the series. [[spoiler: Tanba is chosen as the ace, but sustains an injury before the summer tournament, when jerseys are handed out, he is given the ace number, thus making him the ace. The reporters mention this as the main reason why Seidou lost against Inashiro on the road to Koshien.]]
** [[spoiler: After the loss against Inashiro and the third years graduated, jerseys were redistributed to the first string players, Sawamura was given 18, Kawakami stayed at 10, and Furuya was given the ace number, 1.]]
** In terms of batting, Haruichi boasts the highest avg on the team at .571 (meaning he hits the ball 57.1% of the time) and during the Summer Tournament of his first year, he boasted a perfect 1.000, the next closest to him is Shirasu with .333 (33.3%, hits a third of the time).
* AdaptationalDyeJob: In Ryousuke's [=OVA=], the Kominato brothers hair is depicted in a reddish pink color rather than their standard light pink.
* AffectionateNickname: Sawamura was called "Ei-chan" by his Junior High team and he calls Haruichi "Harucchi" (which basically means "Little Haru-chan") fondly. In their childhood, Haruichi referred to his brother as "Ryou-chan," and their mother still calls him it.
* AloofBigBrother: Ryousuke is this to Haruichi. His [[BigBrotherInstinct instincts]] were also aloof, he'd lightly scold Haruichi for crying rather than standing up for himself when bullied, but would then in secret go fight those that bullied his brother.
* AlwaysSomeoneBetter: Since the first moment Furuya gets a place on the team due to his insanely strong pitches. Sawamura, however, has to fight for it.
* AwesomenessByAnalysis: Miyuki usually uses this to strike out the batters, then uses it again to score when at bat.
* BackStory: To the date three of them has been released as extras: Miyuki's, Kuramochi's and Ryousuke's.
* BattleAura: At times Tetsu can get extremely passionate when facing a rival. Or his own teammates.
** Furuya gets a lot like this, too.
* BattleCry: Before every match.
* BerserkButton: Seriously, don't badmouth Chris in front of Miyuki. Ever.
* BigBrotherInstinct: Ryousuke was very close to Haruichi when they were younger and protected him from bullies, however, their relationship became estranged when Haruichi took up baseball and they played the same position. Currently, they are still estranged, but Ryousuke shows that he still cares and looks out for Haruichi, just not as openly as before.
* BigBrotherWorship: Haruichi really admired Ryousuke since they were little kids. In fact, it's his worship of him that makes him decide to use wooden bats, in order to catch up to Ryousuke, and have Ryousuke acknowledge him. [[spoiler: He does, in their decisive match against Inashiro Tech]]. In their youth, Ryousuke described it as Haruichi "copying" him.
--> '''Haruichi:''' ''"Aniki has always been my hero."''
* BigLittleBrother: Downplayed, but played straight; Haruichi is roughly an inch taller than Ryousuke, who is two years his senior
* BilingualBonus: Shunshin who speaks fluent Japanese as well as his mother language Taiwanese, even speaking in Taiwanese at his at-bat during the Seidou-Akikawa game.
* {{Bishonen}}: Several characters could fill this trope, Miyuki being the most evident.
* BlindingBangs: Haruichi.
* BrokenAce: [[spoiler:Tanba becomes this during the series.]]
* [[spoiler: BrokenTears: Narumiya, after Inashiro lost at Koshien, in both his first and second year.]]
** [[spoiler: Most of Seidou's players after the final against Inashiro. Especial mention to Tetsu.]]
** [[spoiler: Eijun gets these when he is placed in the first string and Chris isn't.]]
* BookDumb: Sawamura and Furuya qualify as this. To the point that Sawamura has to beg Kanemaru for help. He barely passes his exams. Furuya does not.
* [[spoiler: BreakTheCutie: Sawamura during the final game against Inashiro.]]
* BrutalHonesty: Miyuki has no problem in telling the first-years pitchers how much they suck.
* ButNotTooForeign: Chris, who is half-American.
** Averted with Shunshin, who is 100% Taiwanese and is from Taiwan.
* ButtMonkey: Poor Sawamura is the usual target of Kuramochi's judo moves, and of Ryousuke's head-chops.
* TheCaptain: Tetsu. [[spoiler: Miyuki, later.]]
* CastOfSnowflakes: Most times the author puts special attention in the spectators.
* ChildhoodFriends: Narumiya and Miyuki seem to know each other pretty well.
** Toujou and Kanemaru played in the same team during Junior High.
* CloudCuckoolander: Furuya's mind is not always where it should to.
** Todoroki Raichi shows signs of this, too.
* CombatCommentator: Miyuki. Justified as he is the one in charge of calling the pitches.
* TheComicallySerious: Furuya.
* ConfusionFu: Sawamura's specialty. His pitches lack the speed and control of most of the other pitchers, but because of his unique pitching style, the trajectory of his pitches shift, even if he uses the same pitch over and over. And the shift can be subtle or wild, depending on how hard he pitches. Thanks to the lower speed of his pitches, he's easier to get hits off of than, say, Furuya, but because it's completely impossible to predict the ball's trajectory shifts, it's damn near impossible to get a ''decisive'' hit off of him. This makes him harder to score off of than the other pitchers, despite them being harder to hit off of.
* [[spoiler: CripplingTheCompetition: One of Teikou's players tries to do this to Miyuki. It kicks him back in the face when Miyuki, despite being hurt, ends the game with a [[AwesomeMomentOfCrowning very epic]] home-run.]]
* CrowdChant
* CrowdSong
* CuteSportsClubManager: Seidou has four of them.
* CurbStompBattle: [[spoiler: Seidou's first couple of games at the Summer Tournament are called games.]]
* CurtainsMatchTheWindows: Haruichi.
* DeadpanSnarker: Miyuki, all the time.
* DeathGlare: Sawamura tries to scare first-base runners with one.
* DelusionsOfGrandeur: Sawamura, who seeks to be the "Ace" of the Seidou High baseball team, despite not really knowing the first thing about baseball apart from the basics...
* DeterminedExpression
* TheDeterminator: Sawamura is the proclaimed mood-maker of the team.
* DoesNotKnowHisOwnStrength: Furuya still has to learn to pace himself when pitching.
* DontThinkFeel: Shunshin Yuu of Akikawa when at bat.
* DopeSlap: Ryousuke used to deliver these first to Kuramochi, and most recently to Sawamura.
* DownToTheLastPlay: [[spoiler: Most of Seidou's games turns into this.]]
* TheDreaded: Tetsu evokes this in rivals when it is his turn at bat.
** Raichi does, too.
* DudeLooksLikeALady: Haruichi has been noted many times that he looks like a girl.
* DullEyesOfUnhappiness: Chris. [[spoiler: It gets better when Sawamura starts to grow on him.]]
* EmbarrassingNickname: Isashiki's "Spitz of Seidou" title, [[BerserkButton don't call him it]].
* [[TraumaticHaircut Embarrassing Haircut]]: Masuko accidentally shaves a huge streak in his head when he forgot to change the setting on his razor, as a result, he had to shave his entire head to even it out, [[HilarityEnsues when he walks into breakfast, the reaction from the team is predictable]].
* EpicFail: Sawamura is terrible at [[PlayedForLaughs batting.]]
** Miyuki being incapable of hitting the ball with the bases unloaded.
* EvenTheGuysWantHim: Most of rival teams are amazed by Miyuki's skills. It takes a turn to worse when even Yakushi's players and coach dubs him as the [[{{bishonen}} pretty boy catcher.]]
--> '''Mishima:''' ''Die, you pretty guy!''
* EyesAlwaysShut: Ryousuke.
* FacePalm: A collective one when Sawamura is on the mound.
* FallenHero: It has been seven years since Seidou went to Koshien.
* AFatherToHisMen: Kataoka, if he only cares about one thing, it's his players. [[spoiler: The best example being him being the first one to run onto the field when Tanba got hit with a pitch.]]
* FriendlessBackground: In a flashback it is seen how no one wanted to play with Furuya due to his pitches being insanely strong.
** Miyuki didn't spend his childhood exactly surrounded by friends, either.
* FriendlyRivalry: Sawamura and Furuya spend big deal of time fighting each other for a place at the mound, for a sit next to Miyuki, or even for a [[HilarityEnsues tire]]
* FourEyesZeroSoul: Miyuki. And [[ItAmusedMe it amuses him]]
--> '''Furuya:''' ''I've always thought about this, but... Miyuki-senpai, your personality is really nasty.''
--> '''Miyuki:''' ''Haha. Well said!''
* FragileSpeedster: Furuya, who has the fastest fastball of all of Seidou's pitchers, has weak nails and poor stamina, even worse in Summer, as he hails from Hokkaido.
** Haruichi is an all-around amazing baseball player, being able to pick where and how far he hits a ball at bat, can jump up and catch a ball and throw it while still in air, and has incredible speed, all in all, his skills surpass his first-string, third year, older brother, Ryousuke; but like Furuya, he lacks in stamina.
* TheGadfly: Miyuki ''loves'' to mess with people. Just because he can and [[ItAmusedMe it amuses him]].
* GameBreakingInjury: Chris's shoulder, which he's trying to rehab. Also his former teammate from middle school Zaizen suffer a leg injury.
** [[spoiler: Right when Tanba solidifies his spot as TheAce, he gets hit in the jaw from a wild pitch during a game, the game was called as a result from the injury and he was out for several months with a fractured jaw. As a result from the injury and recovery process, Tanba was benched for the first few games of the summer tournament.]]
* GogglesDoNothing: Miyuki's. Averted, as WordOfGod states he uses contact lenses during the games and the googles to avoid dust.
* HairTriggerTemper: Mei, especially when people get hits off him [[spoiler: in the eighth inning of the Seidou-Inashiro game, Seidou managed to score three runs, Mei was able to stay calm on the mound and finish his pitching session of the inning, but as soon as Inashiro was in the dugout, he went into the back area and threw a tantrum.]] His teammates often worry if his frustration and anger will effect his playing.
* HardWorkHardlyWorks: Averted, as everybody trains to the point of collapse.
* TheHeart: Tetsu's role as the team captain.
* HeroWorshipper: Sawamura to Chris.
** Furuya went to Seidou because he read an article about Miyuki.
* HeterosexualLifePartners: Sawamura and Chris.
** Tetsu and Isashiki.
* HeroicBSOD: [[spoiler: Sawamura suffers one after he hits one of Inashiro's players in the 9th inning. It's made even worse when he gets relieved by Kawakami and he blows the save.]]
** [[spoiler: Sawamura also suffers this during the Seidou vs Yakushi game, Raichi hit a homerun off him after Sawamura vowed not to let Kataoka down, he manages to stay calm, but is mentally crushed and is then relieved by Kawakami when he allows two more runners on base. Kawakami also suffers from this in the same game while on the mound, due to the memory of Raichi's homerun scored off of Sawamura replaying mind, affecting his usual control.]]
* HotBlooded: Sawamura, even by manga and anime standards.
** Isashiki, definitely.
* [[spoiler: ICanStillFight: Miyuki decides to hide his injury from the team and play against Yakushi. Even after they realize he asks the coach to let him keep playing.]]
** [[spoiler: Similarly with Ryousuke in the Seido-Inashiro game, as he had injured his leg in the previous game and his continuing to go all out has worsened it. The only one who knows of it initially is Kuramochi, who allows Ryousuke to still play, and Ryousuke never outright tells anyone of the injury. Kataoka eventually catches on and compliments Ryousuke for his toughness, but pulls him out of the game and subs in Haruichi.]]
* IdiotHero: Sawamura. Along with the DelusionsOfGrandeur and HotBlooded tropes above, this is what largely causes almost everyone to write him off thinking that he's just another baseball star wannabe. Furuya also isn't too bright, but he's [[TheStoic a lot quieter]] about it.
* ImportantHaircut: Tanba, the Ace of Seidou as punishment for failing the challenge imposed by his teammates. Though he didn't fail, he was injured by a dead ball before he could properly attempt challenge.
* IncompletelyTrained: At first Sawamura didn't even know how to grip the ball properly.
--> '''Sawamura:''' ''"Four-seam? Is that a foreign rapper."''
* {{Irony}}: Sawamura initially wanted to form a battery with Miyuki upon arriving at Seidou, and he was borderline furious that he was to form a battery with Chris, however, after bonding with Chris, Sawamura wants to keep the battery with Chris alive and is actually ''upset'' that he has to partner up with the person he originally wanted to be his catcher; he slowly comes to accept Miyuki, however, but still desires to be in a battery with Chris.
** It takes him a while but he starts remembering more frequently that he actually only came to Seidou because Miyuki ''left such a big impression.''
* ItsPersonal: [[spoiler: The Fall Tournament gets even more dramatic when the team learns of Kataoka leaving if they don't make it to Koushien.]]
* JapaneseDelinquent: Kuramochi, when he was in Junior High.
* JerkassFacade: Chris.
* TheLeader: Tetsu. [[spoiler: Then Miyuki.]]
* LosingTheTeamSpirit: [[spoiler: After the third years retire.]]
* LoadsAndLoadsOfCharacters: Justified, as a baseball team is usually formed by twenty members, just from the first string.
* LuminescentBlush: Haruichi is highly prone to this.
* ManlyTears: Sawamura as well as other members of the team.
** Also when a Team is defeated in a tournament.
* MyGodWhatHaveIDone: Sawamura gets this reaction after finding out about [[spoiler:Chris']] GameBreakingInjury after he insulted him.
* [[spoiler: MyGreatestFailure]]: [[spoiler: Mei views his wild pitch from the previous year's Koshien, which resulted in Inashiro being eliminated, as this; it's so bad that it haunts him, keeping him up at night and unable to get proper sleep, and he wants nothing more than to go back to Koshien and redeem himself. He gets the chance to after Inashiro beats Seido, but Inashiro once again gets eliminated.]]
* TheNapoleon: The Kominato brothers are the shortest two players on the team, Haruichi being marginally taller than Ryousuke, both are below average height for boys their age and they are 164cm or roughly 5'4 (Haruichi) and 162cm or 5'3 (Ryousuke) in comparison to the rest of their team who are in the 170+ centimeter range.
* NewPowersAsThePlotDemands: Sawamura seems to learn a new pitch ball before every important game. [[spoiler: It doesn't always works.]]
* TheNicknamer: Sawamura comes up with a nickname for many members of the team; such as:
** Haruichi - "Harucchi", Ryousuke - "Nii-san", Jun - "Spitz-sempai" and "Beard-sempai", Tetsu - "Leader", Kataoka - "Coach Shades" and "Boss"
* NoIndoorVoice: Sawamura is a very loud kid.
--> '''Miyuki:''' ''We'll go with Kawakami and Noisymura~''
** Isashiki cannot tone it down, either.
--> '''Isashiki:''' ''Who are you calling, Spitz-sempai?!''
* [[spoiler: PassingTheTorch: With the third years graduating, a lot of first and second years took over the empty positions, the most prominent being Haruichi taking his brother's position, number, and batting spot before moving into the clean-up batters.]]
** [[spoiler: Tanba's ace number is passed to Furuya.]]
** [[spoiler: Leadership is passed from Tetsu to Miyuki along with his position as clean-up batter.]]
* PerpetualSmiler: Ryousuke.
* PintsizedPowerhouse: The Kominato brothers.
* PreAssKickingOneLiner:
-->[[spoiler: '''Miyuki:''' ''We're not the King. We're the Challenger.'']]
* PutOnABus: The third years after the summer tournament, justified as they are graduating.
** TheBusCameBack: Most of the retired third years are seen during the new team training and matches.
* ReactionShot: More often than not.
* RealMenCook: It is stated in the [[AllThereInTheManual Official Guide Book]] that Miyuki can cook. It is later confirmed in the anime he learnt to cook at an early age because of [[ParentalNeglect reasons]].
* RedOniBlueOni: In the anime, Seidou and their opposing team are depicted with red or blue coloring, it's used to show both state of mind of the individual showcased players and the team's personalities in comparison to the other.
** It was best shown during Raichi's second at-bat against Eijun; Eijun was blue and Raichi was red, Eijun was calm, collected, and focused on doing well for his coach and team while Raichi was eager and focused on hitting the ball because he wanted the challenge rather than doing it for the team.
* RousingSpeech: Kataoka is a master of this.
* RunningGag: Despite Sawamura being awful at batting, he is amazingly good with bunts. He even gives tips to his teammates. And no, they're not exactly thrilled about it either.
--> '''Sawamura:''' ''Where are you bunting the ball?? You have to be like this and hit it right on the line!!''
--> '''Kuramochi:''' ''Shut up! Hearing this from you really pisses me off!''
** Furuya has an astonishing ability to fall asleep anywhere.
* SayMyName
--> ''"MIYUKI KAZUYAAA!"'', anyone?
* ScaryShinyGlasses: Miyuki
* SecondPlaceIsForLosers: There's no glory for those who stay at Koshien's gates.
* SempaiKouhai: Miyuki doesn't seem to give a rat's ass about seniority when he's giving advice or calling a game [[CrowningMomentOfFunny (though he would complain occasionally when Eijun shows alot of respect to the rest of his seniors except him)]]. This seems to tick a fair number of people off; Tanba simply seems irritated by it, but a few of Miyuki's seniors in junior high were planning to beat him up over it. Only Chris is an exception.
* SeriousBusiness: Teenagers with an only concern- baseball.
* SexySpectacles: The female reporter from ''Baseball Kingdom'' admits to having a glasses fetish. She gushes over Miyuki, and acquires a LuminescentBlush when she observes the bespectacled pitcher from Akikawa Academy.
* ShesNotMyGirlfriend: Sawamura says this word for word whenever Wakana is mentioned.
* ShoutOut: In episode 45, Narumiya laughs going ''"Upupupu"'' and talks about instilling despair into Sakurazawa, clearly he is a fan of [[Anime/DanganRonpa Monobear]]
** Raichi's ''"Kahahaha"'' also qualifies as this.
** Whenever it's Yuki's turn at bat, Seido's band, other non-first string players, and crowd members in support of them will sing "Lupin the Fire" by [=SEAMO=].
* ShrinkingViolet: Haruichi is the shyest and least outgoing member on the team off the field, and surprisingly, Tanba was this during his first year.
* SiblingYinYang: Ryousuke and Haruichi; Haruichi is the shy, sweet, kind, and mellow younger brother in comparison to Ryousuke who is borderline sadistic, violent, and condescending at times; they also seem to have a RedOniBlueOni kind of bond.
* SpoilerOpening: There are a couple, but "Final Victory" is probably the most jarring example.
**The first opening (Go Exceed) shows Sawamura [[spoiler:wearing the #20 jersey, which makes his getting into the first string a foregone conclusion.]]
** The third opening (Hashire Mirai) is first used during the Seido vs. Inashiro game. It features some clever foreshadowing, but also [[spoiler:the fact that Yakushi appears at all, after having been defeated by Seido in the preliminaries, makes it pretty obvious that the protagonists won't be playing at Nationals.]]
** The sixth ending (Final Victory) starts after the Inashiro game. [[spoiler: Furuya is clearly wearing the ace number, which makes Sawamura's role in the recent loss and his mounting mental issues that much more painful.]]
* TheSouthpaw: This is a pretty big part of Sawamura's role in the series, apart from his sporadic pitching, the fact he's left-handed helps with his opportunity to join Seidou and is the only lefty pitcher Seidou has.
** Also, Inashiro's ace, Narumiya Mei, is a southpaw and this along with his prodigious pitching helps solidify Inashiro as one of Seidou's main rivals.
* StealthMentor: Chris.
* StrongFamilyResemblance: Haruichi looks like a younger Ryousuke, just with bangs. Both boys also resemble their mother, Ryousuke looking almost like a male carbon copy.
* SupportingLeader: Tetsu.
* TaughtByExperience: Sawamura has no formal baseball training. Whatsoever. In fact, he hardly knows some of the basics of the game, but this lack of instruction actually helped him to develop a unique pitching style.
* TearsOfJoy: Sawamura.
* TeenGenius: Narumiya.
* ThoseTwoGuys: It's easy to forget that Kadota and Shirasu are in the starting lineup; especially since Kadota often gets pulled out of games once Furuya is done his end of the pitching cycle. Eijun even [[LampshadeHanging lampshades]] this with Shirasu when he compliments him for his performance at bat early in the series and has to ask for his name.
** The other members of the first string that don't regularly play.
** Literally everyone outside the first string from Seido are easy to forget, especially since there are so many; the only really memorable member in the stand is Kanemaru [[spoiler: and he gets upgraded to first string after the summer tournament.]]
* TookALevelInJerkAss: [[spoiler:Furuya, after receiving the ace number his arrogance grew, and on more than one occasion thought, "I want the team to need me more."]]
* TournamentArc: Every team dreams with reaching Koushien. They have to win every match in the Preliminaries to get there.
* TryingToCatchMeFightingDirty: During the Akikawa-Seidou game, Shunshin Yuu lures the umpire to call strike outs that otherwise would have been balls. He is able of doing this because of the perfect control he has over his pitches
* UnderDogsNeverLose: [[spoiler:Except when they do.]]
* VitriolicBestBuds: Miyuki and Kuramochi.
* YouAreInCommandNow: [[spoiler:Tetsu to Miyuki after the third years retire.]]
* WorthyOpponent: [[spoiler: Sawamura is getting there.]]
* WrestlerInAllOfUs: Kuramochi sure does know how to apply a good Boston Crab, along with other submissions and techniques. WordOfGod says he learned how to wrestle when he was younger and used to do it before baseball.
* YearsTooEarly: Miyuki to Sawamura during a practice game against some third years.
--> '''Sawamura:''' ''And here I thought I'd able to play against you.''
--> '''Miyuki:''' ''Haha. You're still a hundred years too early.''
* YouGottaHaveBlueHair: The Kominato brothers.
* YouSuck: Most of the first story arc is about Eijun struggling to be accepted, despite being told this (especially by Chris) in some form or another.
** Later on, we get a flashback of the seniors in their freshman year being told they suck as well. Their freshman year was referred to as "The Hopeless Year."


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