Hajime Yasaka goes to stay with his grandfather over the summer in a small town. While he's there, he meets a girl, Sayoko Arashiyama. "Arashi" for short. When the two join hands, Arashi reveals that she "connects" with Hajime, and that she is also a ghost. When they connect, Arashi and Hajime can jump through time, which Arashi uses to show Hajime the past and, with his help, to correct it. In the present, she gets to know the modern era and work with the colorful cast of people at the cafe Hako-bune ("Ark", ''e.g.'' [[Literature/TheBible Noah's]]).

Based on the manga by Jin Kobayashi, creator of ''SchoolRumble'', and adapted into an anime in the spring of 2009 by Creator/StudioShaft, with a second season, ''Natsu no Arashi! Akinaichuu'', airing in the fall of that year.
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!!Tropes in ''Natsu no Arashi!'' include:

* ActorAllusion: In episode 8 of the second season, Yayoi is wearing an IndianaJones type of outfit. The same is often true for Ichijou from PaniPoniDash, another Creator/StudioShaft series. Both characters are voiced by Ai Nonaka.
* ArbitrarySkepticism: Hajime was incredibly suspicious of Arashi at first, being a science nerd. But an ''E.T.'' like moon leap was all it took for him to accept her. Sort of.
* AuthorAppeal: ''Belly buttons''. Usually Arashi's.
** Mostly in the anime version, it seems. The manga has more of [[ContemplateOurNavels this]] sort of navel observation and less of [[BareYourMidriff that]] sort.
* BeautifulAllAlong: Kanako can be quite attractive ([[InformedAttractiveness at least in the eyes of the cast]]), especially when she [[{{Meganekko}} wears glasses]]. Regrettably, [[RealWomenNeverWearDresses she hates the idea]].
* BeachEpisode: Wasting no time to get on with it, the first episode of the second season.
* {{Bifauxnen}}: Jun, who makes a pretty convincing male, at least to Hajime. Though Jun's a pretty convincing girl, too.
* {{Bishounen}}: Yamashiro. Hajime cannot tolerate him for that reason.
* BoisterousBruiser: Hajime ''and'' Arashi, who develops into this partly due to his influence.
* ButtMonkey: poor Hideo.
* {{Cameo}}: Pay close attention to the customers at the start of episode nine. You'll notice, in order [[Manga/{{Saki}} Kiyosumi's mahjong club]], the ''Manga/HidamariSketch'' girls, the ''Manga/KOn'' girls and [[Manga/MariaHolic God and Father Kanae]]. [[Manga/PaniPoniDash Mesousa]] can be spotted in the same scene.
* CharmPoint: Hajime states that Arashi's [[TheDitz silliness]] is a part of her charm.
* ChristmasCake: "Master's expiration date".
* ClingyJealousGirl: Kanako towards Yayoi at times. When it's revealed that Yayoi can connect with the Master as well, she wonders if Yayoi was corrupted by connecting with her.
* CoolBigSis: Master, to a degree, Shades even calls her "nee-san" from time to time. Makes one wonder, how old is she...
* CoolShades: Hideo, the man with the sunglasses hunting for Arashi.
* CouchGag: Another part of a story about a mangaka, his girlfriend, and some aliens is shown in every episode's opening; the colors used for the nude Master and Yayoi, Kanako, Kaja, and Arashi silhouettes is also different every opening.
* CuteGhostGirl: Arashi, Kaja and [[spoiler:Yayoi]], though they don't display many "ghostly" signs. A slightly less cute one, [[spoiler:Kanako]], displays some more.
* DatePeepers: Time traveling date peepers. It's entirely possible.
* DeadpanSnarker: Jun sometimes gets tired from his friends' quirks...
* [[EveryoneCallsHimBarkeep Everyone Calls Her Barkeep]]: Or Master, rather, the Japanese equivalent. (Her names' Sayaka.)
* FishOutOfTemporalWater: All the ghost girls, but Kanako and Kaja have the toughest time adjusting to the present.
* FiveManBand: The primary squad of the Hako-bune:
** TheLeader - Hajime.
** TheLancer - Jun.
** TheBigGuy - Master.
** TheSmartGuy - Kaja, altough sometimes Hajime himself takes that role.
** TheChick - Arashi.
** SixthRanger - Shades.
* FanserviceWithASmile: The Hako-bune isn't normally a MaidCafe, but it comes pretty close to being one.
** Played straight during the most part of episode 5, after Master makes everyone, including herself and Hajime, wear color-coded maid dresses.
* ForWantOfANail: Sankichi, a young man that Arashi saves in the past, goes on to become the father of Hideo, the man with the shades tracking her down in the present. See Timey Wimey Ball below for more on how Hajime and the rest dissect this issue.
* FreakyFridayFlip: Jun and Hajime swap bodies, which Jun finds troublesome. Mostly because of the gender issue.
* GenderVocabularySlip: Rather rare in public with Jun, but she goes ahead and slips right back into "''watashi''" when people aren't around. Rather softens the blow of [[{{Bifauxnen}} the]] [[TheUntwist "reveal"]].
* GlamourFailure: All video with Arashi recorded on screen has noise running through it. Hints, hints.
* HereWeGoAgain: The last episode is a mirror of the first episode in many ways, right down to the titles. Which are, curiously, out of order. "Playback Part 2" was the first episode and "Playback Part 1" is the last.
* HeyItsThatVoice: Arashi is Creator/RyokoShiraishi known for the role as [[Manga/HayateTheCombatButler Hayate]].
** Hajime and Kaja sounds like [[EurekaSeven Renton and Eureka]].
** The guy who keeps asking for salt sounds like [[SuzumiyaHaruhi Ky]][[Creator/TomokazuSugita on]].
*** Scratch that, almost EVERYBODY not related to the main plot sounds just like him.
** Yayoi is [[VisualNovel/{{Clannad}} Fuuko]] and Kanako is ''[[LightNovel/{{Toradora}} Minorin]]''.
** And Jun is [[SoulEater Maka]].
* HardDrinkingPartyGirl: A beer is Master's fuel for life.
* HonestJohnsDealership: The Master of the Hako-bune is a scheming con artist.
* HotSpringsEpisode: Episode two of the second season. {{Mahjong}} playing included.
* IdiosyncraticEpisodeNaming: All the episode titles are the names of old J-Pop songs, mostly from the late 70s/early 80s.
* IgnoreTheFanservice: Master's increasingly desperate attempts to net herself a guy at the beach fail by Kanako and Yayoi being nearby and being themselves.
* IllGirl: Yayoi is [[spoiler:an Ill Ghost]].
* InstantAwesomeJustAddMecha: The Hako-bune, for no explained reason (and more Medium Blending) can turn into a giant robot. There's a remote for it.
** Specifically it turns into the ''{{Daimos}}''.
* InstantCosplaySurprise: Jun really needs to watch what clothes are laid out...
* JerkWithAHeartOfGold: Shades. The Master of the Hako-bune can also show some good heart, when the money isn't involved.
* KnifeNut: [[spoiler:Kanako]].
* LatexPerfection: An old man can disguise himself as a young girl with ease.
* LikesOlderWomen: Hajime proudly declares his preference of older, more developed girls. His [[{{Bifauxnen}} fellow middle-schooler]] Jun is not amused.
* ManicPixieDreamGirl: Arashi.
* MayflyDecemberRomance: take a guess.
* MediumBlending: A gag that gets used a few times is a cutaway to a shot of the Hako-bune getting wrecked as a live-action model.
* {{Meganekko}}: Everyone in episode 5 of the second season, when Master announces "Meganekko Day" for all of her workers. Speciffically, to make Kanako wear glasses, which gets her transformed into a MahouShoujo, to her great horror.
* MoralityPet: Yayoi to Kanako
* MundaneUtility: Time travel powers are abused to speed up fermenting time and to make doing things around the Hako-bune easier. Jun wonders if that's such a good idea.
* NeverTheSelvesShallMeet: The rules of time travel work as such: If you meet yourself, you vanish. Time doesn't want there being two of the same person in the same area. Maintaining a safe distance is necessary. This also makes it easy to whether you're, say, hiding around the corner, however; the closer you get to yourself, the more you fade out.
* OnceAnEpisode: There's almost always the man in the back of the Hako-bune, asking for salt. He even goes so far as to interrupt Hajime's timeline graph to ask. At this point, the cast is probably not aware he exists.
** ThrowTheDogABone: After 26 episodes spread across two seasons, with his existence being largely ignored, Arashi finally hands him some salt in the last episode of ''Akinaichuu''.
* OddlyNamedSequel - The second season is called "Akinai-chuu" meaning "Open for Business". Ignoring the fact that the main characters already spent 12 episodes working for the Hako-bune in the first season.
** Actually... "Akinai Chuu" isn't written the way you'd normally write it. In Natsu no Arashi!, the word "akinai" meaning "business" is written with kanji "spring", "summer" and "winter". Missing the "autumn", eh? Japanese for "autumn" is "aki". No autumn = aki nai. Remember? Should the autumn come, Arashi and the crew will disappear, so the title holds special significance in that sense.
* OneeSama: Kaja gives sort of that atmosphere to Jun.
* OnlyKnownByTheirNickname: Shades. Real name [[spoiler:Hideo Murata]].
* OpeningShoutOut: The final episode has the cast doing their poses from the opening, with neither them nor anybody else acknowledging they're actually doing so.
* OvernightAgeUp: Jun, in episode 11 of ''Akinaichuu'', ages up and becomes a lot more feminine. Only Arashi knows it's really her. Everyone else thinks that Jun's her own older sister, Ryoko.
* PrivateEyeMonologue: Hideo, on a mission in the mountains. A beetle is crawling over him the whole time.
* RomanticTwoGirlFriendship: Yayoi and Kanako show as much affection towards each other as an average pair of lovers.
* RunningGag: [[FailureIsTheOnlyOption The guy asking for salt]].
* SceneryCensor: Leaves fall very conveniently to obscure Jun's gender.
* SecondHandStorytelling: Episode seven of ''Akinaichuu'' is a time-travel heavy episode that takes place completely in the present day, with the audience only hearing of what happened three days ago.
* SelectiveObliviousness: Hajime is unable to realize that Jun is a girl... despite groping her breasts couple of times, seeing her half naked and ''swapping bodies with her'' at one point. In the Hot Springs Episode, he sees her ''completely naked'' and still doesn't catch on.
* SensitiveGuyAndManlyMan: or so it seems.
* SetRightWhatOnceWentWrong: Arashi and Hajime's time jumps are usually for this purpose. This is in contrast to Kaja, who believes that time is something not meant to be messed with.
* ShipTease: Arashi and Hajime, Hajime and Jun, Shades and Kanako, [[LesYay Kanako and Yayoi]], then Yayoi and Yamashiro-san[[spoiler:[[{{Squick}} 's dog]].]]
* ShoutOut: It's a Shaft series, this is expected. Customers that look like [[SchoolRumble Tenma and Harima]] can be seen seated in the Hako-bune in one episode, Yayoi and Kanako have a regular segment that alludes to other anime series, and the opening is a barrage of references to old CD covers.
** The show subverts its own running gag when, in episode eleven, Master is able to correctly guess the anime (''GlassMask'') before Kaja even gets the first sentence out.
** [[VideoGame/{{Touhou}} Reimu's head]] is seen in the first episode.
** Two customers look similarly to [[Anime/MobileSuitGundam Amuro and Char]] on ep 5, with Creator/TomokazuSugita does his best Creator/ToruFuruya and Creator/ShuichiIkeda impression.
** Also in ep 5 was the [[SamuraiX Hiten Mitsurugi Ryu]].
*** [[SaintSeiya PEGASUS RYUUSEI KEN!!!!!]]
** In episode 1 of the second season two main characters of ''Yaranaika'' are shown trying to pick up Yayoi and Kanako.
** There's a number of Eureka 7 shoutouts because of HeyItsThatVoice. In second season Hajime is playing a fighting game as Renton.
** At the end of episode 2, [[FutureBoyConan Conan, from the future,]] comes in as a customer.
** In the middle of episode 3, during the Arcade Center sequence, two kids can be seen among the crowd doing the classic Fusion Dance Pose from DragonBallZ.
** [[http://www.youtube.com/watch?v=FRsssSZLhQA Who could imagine that an EarthBound reference could be so disturbing?]]
* SignatureStyle: You'll notice many of director Shin Ohnuma's idiosyncrasies (mainly those angular frames), a good deal of which were carried over from his ''EfATaleOfTheTwo'' adaptations.
* SpoilerOpening: The opening spoils Kanako's HeelFaceTurn and Yayoi gaining the ability to walk ([[OneWePreparedEarlier not that the first episode didn't]]).
* StableTimeLoop: There are quite a few, with the first episode having an increasingly complicated time loop. Everything from the events of the first/last episodes of the first season all the way up to how Arashi and Hajime met.
* TheStraightMan: Jun and, to a lesser extent, Kaja, yes, a crossdressing girl and a ghost.
* SurrealThemeTune: Second season opening theme makes less than no sense and has no relevance to the series itself.
* SweetTooth: Kaja, who's easily coerced into doing things for cake and takes her pudding very seriously.
* TestOfCourage: One of these takes place at the hot springs. Yayoi is terrified of ghosts despite being one herself.
* [[TwelveEpisodeAnime Thirteen Episode Anime]]: Twice.
* TimeyWimeyBall: A good part of episode nine is dedicated to Hajime and crew trying to untangle the timey-wimey ball that makes up their universe. Mostly in the matter of "What happens to the timeline that was when we change it?" This isn't made any easier by the fact that Master has zero understanding of how time travel works. She thinks that leaping back ten years would make her into a sexy teenager again, when it would really just set the current her in a different time.
* TitleDrop: In the penultimate episode of ''Akinaichuu'', in the middle of an impassioned speech about helping those who come into the Hako-bune, Arashi works the series' name in.
** In several episodes in the first season, the series' name is written across many places here and there. A particularly prominent time is during [[spoiler: Kanako's and Hajime's argument in Yayoi's house]] during episode 10.
* TransformationSequence: Arashi and Kaja change into their schoolgirl uniforms just before they time leap. The sequences are usually short, but always flashy.
* {{Tsundere}}: Jun is a B type. ''Anyone'' at her place would run out of patience around Hajime.
* VisualInnuendo: while Kanako [[LesYay appears anything but heterosexual]], interestingly, she has a ''[[EroticEating thing]]'' for [[FreudWasRight cucumbers]] of all of things.
* WonderTwinPowers: Two are needed to time travel.
* YamatoNadeshiko: [[LampshadeHanging Lampshaded]] by the Master in reference to all four girls but only Kaja, the ''German'', fits perfectly. Arashi not so much, Yayoi is more of a {{Kawaiiko}}, and Kanako can be called the opposite of it.
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