Dr. Otoi, the world's most eminent robot scientist, has just finished work on Signal, his most incredible creation yet. Made from MIRA, an almost supernaturally strong substance with regenerative properties, Signal will be both incredibly strong and incredibly lifelike. As a gift to his grandson, Nobu, Dr. Otoi asks him what sort of personality to give his new robot. Without hesitation, Nobu answers: "[[BigBrotherMentor Like a big brother!]]" Which would all go quite well if Nobu didn't sneeze during the programming.

Now Signal is the pinnacle of combat robot technology, with a huge glitch: Every time Nobu sneezes, he transforms in a [[{{Keet}} hyperactive]] {{Fun Size}}d "Chibi Signal" with an [[TrademarkFavoriteFood adoration for chocolate.]] In some ways, though, it's preferable to the full-sized Signal, who is what is technically known as an "arrogant airhead". He's in good company, though, as his family includes the BrilliantButLazy [[InsistentTerminology (beautiful)]] robot scientist Chris, Dr. Otoi's notoriously spacey son, and a host of [[RidiculouslyCuteCritter adorable but inexplicable mini-robot creations]].

Of course, with great technology comes those who want to steal said technology, and Dr. Otoi's old rival and colleage, Umenokoji, is after the MIRA Signal's made up of. He plans to kidnap Signal by first kidnapping Pulse, Signal's older brother/prototype, who would technically be inferior if his creator, Dr. Otoi's son, hadn't just decided to randomly upgrade Pulse with some new super-weaponry. Thus kicks off a series of wacky hijinks involving robot battles, super-science, robot battles, unlucky policemen, robot battles, kidnapping plots, robot battles, and did we forget anything? Oh yeah. Robot battles.

One of the wackier {{OVA}}s to come out of the 1990s.
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'''This anime contains examples of:'''

* AbsentmindedProfessor: Seems to run in the Otoi family.
* AloofBigBrother: Pulse, though that's [[BrainwashedAndCrazy not exactly his fault.]]
* BaitAndSwitchCredits: Absolutely '''nothing in the opening actually happens in the show.'''
** The events and characters ''do'' appear in the manga, though only one volume was ever officially translated into English.
* BattleAmongstTheFlames
* {{Bishonen}}: Signal must be the world's prettiest robot boy. The show certainly spares no expense in [[MrFanservice the loving closeups of his face, or his long flowing hair, or his]] [[TransformationSequence naked transformation sequence.]]
* BigBrotherBully: Dr. Otoi worries that Signal will develop this personality when Nobu suggests making him a big brother type. [[JerkAss He does, in part]], [[JerkWithAHeartOfGold though he still cares deeply for Nobu.]]
* BladeAboveTheWrist: Pulse's weapons. Also both {{BFS}}es.
* BlindWithoutEm: Pulse should really get some glasses.
* BrilliantButLazy: Chris is a very smart robotic engineer, usually, she just lacks drive.
* CurtainsMatchTheWindow: Chris has pinkish-red hair and eyes, Nobu's hair and eyes are the same shade of brown, and an argument can be made for Signal, though his aquamarine hair just ''slightly'' mismatches his eyes.
* CopyProtection: In-universe, the MIRA file data is protected by... a whack-a-mole game featuring Chibi-Signal. ItMakesJustAsMuchSenseInContext.
* DancingTheme: The ending theme, with cute dancing robots.
* TheDitz: Erala doesn't exactly have the most expansive CPU.
* EleventhHourSuperpower
* FanService: Signal is a walking fountain of fanservice.
* FlawedPrototype: Pulse is incredibly powerful... but needs to rest often due to his huge energy expendature. [[BlindWithoutEm He's also very nearsighted.]]
* FunSize: Chibi-Signal.
* HeadPet: Nobu has a mostly-unexplained foxlike friend who lives on his head, and who occasionally causes him to sneeze.
* HeyItsThatVoice:
** In the dub, Nobu is [[Manga/{{Berserk}} Rickert]] and Pulse is [[BigBad Griffith]].
*** Ume is Void.
** Professor Otoi is none other than [[Franchise/SonicTheHedgehog Dr. Eggman]] himself!
** Chris is [[LightNovel/{{Slayers}} Lina Inverse]].
** Erala is [[Franchise/{{Pokemon}} Jessie]]
* HotBlooded: Signal, to the point where he's frustrated by living in such a peaceful town.
* HypocriticalHumor: "It's wrong and dishonorable to take advantage of someone when he's weakened! Now let's knock out Pulse while he sleeps!"
* InvoluntaryShapeshifter: Nobu's sneeze triggers Signal's transformation from regular size to chibi-size and back again.
* JerkWithAHeartOfGold: Big Signal acts like a pretty normal big brother, which means he bounces between knocking on Nobu and being nice to him.
* {{Keet}}: Chibi-Signal.
* KidAnova: Nobu ''tries,'' anyway, especially where Erala is concerned. Chris makes fun of him for going through puberty.
* {{Leitmotif}}: Epsilon has a ''hilariously inappropriate'' leitmotif. It sounds like cutesy elevator music. Epsilon himself isn't really [[GiantRobot the elevator music type.]]
* LethalChef: Erala. Her habit of [[TheKlutz breaking every dish]] probably contributes to this.
* LittleBigBrother: The younger of the two henchmen brothers is gigantic; the older is teeny-tiny.
* LongHairedPrettyBoy: Both Signal and Pulse have long flowing locks.
* TheMindIsAPlaythingOfTheBody: Big Signal has the typical arrogant big-brother personality, but Chibi-Signal is friendly and cutsey, if obsessed with chocolate.
* MobileShrubbery: Umenokoji's henchmen attempt to sneak out with the help of some obliging bushes.
* NiceJobBreakingItHero: Pulse wouldn't be such a threat if the younger Dr. Otoi hadn't chosen that ''exact'' moment to upgrade Pulse's weaponry.
* NextSundayAD: There's a ton of advanced robotics running around, but the world still looks mostly the same.
* NothingExcitingEverHappensHere: Both Signal ''and'' the one policeman are driven bonkers by the fact that they live in such a peaceful town.
* PigeonholedVoiceActor: In the Japanese dub: Signal is the most bishie robot ever, so let's get [[Creator/HiroYuki the most bishie-voiced actor]] to play him!
* PityTheKidnapper: Erala is so ditzy and clumsy, she is probably not the world's best hostage. Even once she realizes she's been kidnapped, she's too concerned with cleaning for her life to attempt a serious escape.
* RidiculouslyHumanRobot: Robots still have metallic-looking limbs, but for the most part, many of them look identical to people. MIRA is even especially stated to make Signal extra-lifelike.
* RoboFamily: Signal considers both Pulse and Nobu his brothers. "I was made to act like Nobu's brother. But I ''am'' his brother."
* SharpenedToASingleMolecule: Pulse's [[BladeAboveTheWrist Blades Above the Wrist]] are defined as "monomolecular".
* SuperpowerDyesYourHair: Signal, in his super-form, becomes white haired - this would probably be a spoiler if it [[SpoilerOpening wasn't in the opening.]]
* TrademarkFavoriteFood: Chibi-Signal ''loves'' chocolate.
* TransformationSequence: Chibi-Signal-to-Big-Signal has a very dramatic one, complete with ClothingDamage. The first time he does it on screen, the [[ChunkyUpdraft wind of power]] destroys a library.
* YouGottaHaveBlueHair: Justified in Signal's case, as he's a robot.
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