Sou Touma is an MIT-graduated-student who comes back to Japan because he wants to know how it feels to be a high school student. On the other hand, Mizuhara Kana is a strong girl who loves sports. [[TheyFightCrime Together, they work to solve the cases that happen around them.]]

Created by MotohirouKatou.

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Shows example of:
* AbsentMindedProfessor: Deconstructed in one case. [[spoiler:The case show you how bad the impact of AbsentMindedProfessor can have toward people around him. It was so bad that to salvage the situation, [[ZeroApprovalGambit Touma had to take the blame.]]]]
* ActionGirl: Kana.
* AlwaysMurder: Averted. There are great deal of cases like burglary, vandalism, thieving, ''fraud'', even mistaken-for-two-timer-misundertanding case.
* AssholeVictim: A detective series is bound to have these, [[spoiler:even though it's often subverted]]
* AttentionDeficitOohShiny: Touma's little sister. [[AwfulTruth Definitely]] ''[[MyGodWhatHaveIDone not]]'' [[TearJerker played]] [[DeconstructedTrope for laughs]].
* BatmanGambit: Toma employs this at the climax of the first chapter. He bluffs the suspect by pouring liquid that he says could trace the culprit's name. [[spoiler: The liquid is just water, but the suspect scrambles it out of fear, proving himself as the culprit. The bluff will falter if the suspect maintains his cool just a little bit longer, but as Toma says in the conclusion, only machines are completely controlled by logic.]]
* BrainsAndBrawn: Touma and Kana.
* CatchPhrase: [[spoiler:Quod Erat Demonstratum]]
** Doubles as a TitleDrop.
* ChildProdigy: Touma has a BS in physics ''before'' the others even started high school.
* ChurchOfHappyology: During one of Touma's flashbacks, District Attorney Annie Craner was assigned to prosecute a widower who is accused of murdering her husband so she can inherit his fortune to continue paying for the self-help cult-like group called "The Path to Arcadia", an organization she is a part of. As the trial continues, the group sends death threats to Annie, protest against her and accuse the prosecution of a Witch Hunt. [[spoiler:Then one of the widow's friend, an old lady, shoots her when the case is about to be finished. She seemingly was killed. [[FakingTheDead Well, not.]] It got stranger from there, [[KnightTemplarParent with her father involved.]]]]
* {{Cloudcuckoolander}}
* {{Crossover}}: With {{CMB}} and RocketMan. [[{{CMB}} Shinra]] is Touma's cousin.
* HeIsNotMyBoyfriend: But recent development has [[WillTheyOrWontThey shown otherwise....]]
* ItRunsInTheFamily: His sister is a linguist {{Cloudcuckoolander}}, his parents are renowned archeologists.
* IntelligenceEqualsIsolation: Loki was very lonely until Touma showed up.
* ImprobableAge: Touma, the 14 years old MIT graduate.
* KendoTeamCaptain: Kana, despite being a girl, really counts.
* MasculineGirlFeminineBoy
** SavvyGuyEnergeticGirl
* MindScrew: In Chapter 38 where the bosses of Shanghai mafia kill each other. According to the witness, the last boss killed is murdered by the first boss killed. [[spoiler: The truth is, Toma's friend, Hu Jia Hui, has feigned the death of the first boss in order to incite a CycleOfRevenge that destroys the mafia. Then who kills Hu in the end?]]
* MistakenForMurderer: Second case. Which is [[BlackComedy completely]] PlayedForLaughs [[spoiler:since every person involved thought that their loved ones was the one who kill the JerkAss debitor, and as result, involved in ZanyScheme [[IWantMyBelovedToBeHappy to protect the "suspect",]] while in reality, it was completely an accident.[[labelnote:Spoiler]]Well, a ''[[BatmanGambit premeditated]]'' "[[DeathTrap accident]]" [[/labelnote]]]]
* NonActionGuy: Touma, so much. [[spoiler:But that doesn't mean he's a complete wimp, though.]]
* NoSocialSkills: As a result, Touma [[NotGoodWithPeople often incidentally angers other people]], but that's because he just doesn't know any better. [[spoiler:Kana helps him get over it, though.]]
* OnsenEpisode: Subverted in the fact that it while the lands had an onsen, there was a murder and they went there to translate documents. They never got a chance to get into the onsen itself.
* ThePlan: Employed by Touma and the villains alike.
* ShownTheirWork
* TheyFightCrime
* ViewersAreGeniuses: This is probably why it took so long to get [[ScanLation scanlated]], since many of the terms are just too... ''advanced'' for someone who didn't take university.
* TheWatson: Kana plays this role, but rare for the genre, Kana is shown to be able to pretty easily follow Toumas train of thought and often helps solve the case just as much as Touma does.
** Even then, that's because Touma takes time to explain things to Kana (he figured out she will be more helpful if she gets what she was doing) and even then, sometimes if the explanation involved advanced science (like mathematic, for example)... [[EverybodyHatesMathematics yeah.]]
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