History Literature / TheDetectiveIsAlreadyDead

* WhatTheHellHero: Upon learning who Nagisa's heart came from, Kimihiko's initial reaction is to play it down and act as though it's no big deal. Nagisa immediately slaps and berates him for belittling the heart's immense desire to reunite and meet someone she didn't know [[spoiler:which turned out to be him. He then gives her a CooldownHug, and gives a tearful reunion to give some closure to Siesta suddenly dying a year earlier.]]

* ConnectedAllAlong: Volume 6 reveals that [[spoiler: Siesta's recruitment of Kimihiko on the plane as her assistant was not a coincidence or a random twist of fate, but something she had planning for a long time. It turns out she's ''very'' well-acquainted with him due to having worked with him years ago while she was in disguise as a policewoman named "Gekka Shirogane." In the present day, Kimihiko still wonders where Shirogane is and if he'll ever meet her again, blissfully unaware that the woman in question has been right by his side for years.]]

''The Detective is Already Dead'' (''探偵はもう、死んでいる。, Tantei wa Mō, Shinde Iru.''), is a {{light novel|s}} series written by Nigojū with illustrations done by Umibōzu, which began publication by Media Factory in Japan in 2019. Its English release has been licensed by Creator/YenPress. For the manga version, Mugiko has done the illustrations. Likewise, Yen Press has licensed the manga alongside the light novel version. An anime adaptation was done by Creator/{{ENGI}} with the first episode aired on July 4, 2021 as [[ExtraLongEpisode a one-hour special.]] It was announced that it will see another season.

* AnachronicOrder: The light novels are written out of chronological order, and the anime goes even further in adapting material out of order of the novels. The anime's official Twitter account even had to [[https://twitter.com/tanteiwamou_/status/1425771134969024516 post a chart showing which light novel volume the material covered in episodes 1 to 6]] came from. It also shows what light novels received manga adaptations (Volumes 1 & 2 as of that tweet).

** Episode 10: [[spoiler:Siesta's heart destroyed Hel from within and erased her memories, creating a new idenntity named Nagisa Natsunagi.]]

* BreakoutCharacter: Surprising as it might be, Siesta was originally planned to be a PosthumousCharacter soon to be displaced, with the starring role falling on Kimihito, Natsunagi and Saikawa, but the success of the novel made the author keep making her appear.

* NotAllowedToGrowOld: An unusual subversion applied to teenage rather than adult characters. During the series' various chapters and flashbacks, Siesta and Kimihito are shown in scenes set in a ''four years'' range, which should be a world of difference in people their age, yet their character designs in the anime remain just the same among all the episodes, down to the clothing.
* RefugeInAudacity: In "Attention Passengers: Is There A Detective on Board?", Siesta and Kimihito get involved in an aircraft hijacking case. The latter lampshades it when he throws the question on whether a private detective was on board as the justification Albert Coleman aka Bat was seeking her out.

** It is also another WholePlotReference to ''Literature/AriaTheScarletAmmo'', of the same artistic line as ''Gosick'', which also features a legendary detective girl roping the main character along as her sidekick and taking down a criminal organization that employs superhuman members. Aside from this premise, the plane kidnapping in the first volume is a reference to the same in the first volume of ''Aria'', Kimihiro's backstory of losing Siesta echoes Kinji's own of losing his brother, Cerberus is outright a clone of Vlad, the blood bullet used by Siesta in the first episode evokes the Scarlett Ammo, and the whole character of Alicia is basically a semi-parodic copy of Aria herself, all with her name, short height, long pink twin tails, personality, [[spoiler:alternate personality taking over]], [[spoiler:true age higher than she looks]], and relation to the [[spoiler:leader of the villainous organization]] (and once the humor goes away, Alicia ends up being ascended to the same [[spoiler:main character role]] Aria plays in her own series).

** Kimihito's house has some weird objects at the background, among them a tribal mask, when the female main character intrudes in his house and wears his clothing. This whole scene makes a subtle reference to Haruaki's house and the introduction of Fear in ''Literature/CubeXCursedXCurious''. Siesta's seven items also echoe the cursed items employed by the characters of said series.

''The Detective is Already Dead'' (''探偵はもう、死んでいる。, Tantei wa Mō, Shinde Iru.''), is a light novel written by Nigojū with illustrations done by Umibōzu, which was published by Media Factory in Japan in 2019. Its English release has been licensed by Creator/YenPress. For the manga version, Mugiko has done the illustrations. Likewise, Yen Press has licensed the manga alongside the light novel version. An anime adaptation was done by Creator/{{ENGI}} with the first episode aired on July 4, 2021 as [[ExtraLongEpisode a one-hour special.]] It was announced that it will see another season.

** It is also another WholePlotReference to ''Literature/AriaTheScarletAmmo'', of the same [[ShanaClone artistic line]] as ''Gosick'', which also features a legendary detective girl roping the main character along as her sidekick and taking down a criminal organization that employs superhuman members. Aside from this premise, the plane kidnapping in the first volume is a reference to the same in the first volume of ''Aria'', Kimihiro's backstory of losing Siesta echoes Kinji's own of losing his brother, Cerberus is outright a clone of Vlad, the blood bullet used by Siesta in the first episode evokes the Scarlett Ammo, and the whole character of Alicia is basically a semi-parodic copy of Aria herself, all with her name, short height, long pink twin tails, personality, [[spoiler:alternate personality taking over]], [[spoiler:true age higher than she looks]], and relation to the [[spoiler:leader of the villainous organization]] (and once the humor goes away, Alicia ends up being ascended to the same [[spoiler:main character role]] Aria plays in her own series).

** Kimihito's house has some weird objects at the background, among them a tribal mask, when the female main character intrudes in his house and wears his clothing. This whole scene makes a subtle reference to Haruaki's house and the introduction of Fear in ''Literature/CubeXCursedXCurious'', another ShanaClone light novel. Siesta's seven items also echoe the cursed items employed by the characters of said series.
** The bizarre usage of the word "siesta" (Spanish for nap) as a character name is likely a reference to yet another ShanaClone series, ''LightNovel/TheFamiliarOfZero''.

** The story is a WholePlotReference to ''LightNovel/{{Gosick}}'', another light novel about an unfortunate Japanese student teaming up with a cooler-headed, fair-haired superhuman detective girl to solve mysteries.
** It is also another WholePlotReference to ''LightNovel/AriaTheScarletAmmo'', of the same [[ShanaClone artistic line]] as ''Gosick'', which also features a legendary detective girl roping the main character along as her sidekick and taking down a criminal organization that employs superhuman members. Aside from this premise, the plane kidnapping in the first volume is a reference to the same in the first volume of ''Aria'', Kimihiro's backstory of losing Siesta echoes Kinji's own of losing his brother, Cerberus is outright a clone of Vlad, the blood bullet used by Siesta in the first episode evokes the Scarlett Ammo, and the whole character of Alicia is basically a semi-parodic copy of Aria herself, all with her name, short height, long pink twin tails, personality, [[spoiler:alternate personality taking over]], [[spoiler:true age higher than she looks]], and relation to the [[spoiler:leader of the villainous organization]] (and once the humor goes away, Alicia ends up being ascended to the same [[spoiler:main character role]] Aria plays in her own series).

** Another set of plot points, namely the evil organization creating artificial humans, spreading a memory-affecting drug created from strange lifeforms to control students in a high school, and being in relation with a HumanAlien entity capable to be cloned, are both together and separately references to ''LightNovel/BoogiepopSeries'', where the Towa organization does all of them. Hel also has elements of Boogiepop itself in her androgyny, cape, and being [[spoiler:the alternate personality of a troubled girl]], while Nagisa resembles a young Nagi Kirima in looks, role and personality, and again, the appendages used by Bat in the anime are designed similarly to how the 2019 ''Boogiepop'' anime portrayed those of Eugene.

** Kimihito's house has some weird objects at the background, among them a tribal mask, when the female main character intrudes in his house and wears his clothing. This whole scene makes a subtle reference to Haruaki's house and the introduction of Fear in ''LightNovel/CubeXCursedXCurious'', another ShanaClone light novel. Siesta's seven items also echoe the cursed items employed by the characters of said series.

* WhatTheHellHero: Upon learning who Nagisa's heart came from, Kimihiko's initial reaction is to play it down and act as though it's no big deal. Nagisa immediately gives him an ArmorPiercingSlap and berates him for belittling the heart's immense desire to reunite and meet someone she didn't know [[spoiler:which turned out to be him. He then gives her a CooldownHug, and gives a tearful reunion to give some closure to Siesta suddenly dying a year earlier.]]

''The Detective is Already Dead'' (''探偵はもう、死んでいる。, Tantei wa Mō, Shinde Iru.''), is a light novel written by Nigojū with illustrations done by Umibōzu, published by Media Factory in Japan with five volumes out. Its English release has been licensed by Creator/YenPress. For the manga version, Mugiko has done the illustrations. Likewise, Yen Press has licensed the manga alongside the light novel version. An anime adaptation was done by Creator/{{ENGI}} with the first episode aired on July 4, 2021 as [[ExtraLongEpisode a one-hour special.]] It was announced that it will see another season.

''The Detective is Already Dead'' (''探偵はもう、死んでいる。, Tantei wa Mō, Shinde Iru.''), is a light novel written by Nigojū with illustrations done by Umibōzu, published by Media Factory in Japan with five volumes out. Its English release has been licensed by Creator/YenPress. For the manga version, Mugiko has done the illustrations. Likewise, Yen Press has licensed the manga alongside the light novel version. An anime adaptation was done by Creator/{{ENGI}} with the first episode aired on July 4, 2021 as [[ExtraLongEpisode a one-hour special.]]

** It is also another to ''LightNovel/AriaTheScarletAmmo'', of the same [[ShanaClone artistic line]] as ''Gosick'', which also features a legendary detective girl roping the main character along as her sidekick and taking down a criminal organization that employs superhuman members. Aside from this, the plane kidnapping in the first volume is a reference to the same in the first one of ''Aria'', Kimihiro's backstory of losing Siesta echoes Kinji's own of losing his brother, Cerberus is outright a clone of Vlad, the blood bullet used by Siesta evokes the Scarlett Ammo itself, and the whole character of Alicia resembles a tongue-in-cheek parody of Aria herself, all with her name, short height, long pink twin tails, delusions of grandeur, [[spoiler:alternate personality]], [[spoiler:true age higher than she looks]], and relation to the [[spoiler:leader of the villainous organization]].
** Hel is a ([[{{Bifauxnen}} barely]]) gender-flipped version of Ayato Naoi from ''Anime/AngelBeats'', down to the cap, hair, personality, DaddyIssues, mind control abilities, and even the same red light effect on her eyes when she uses it. Not coincidentially, ''Angel Beats'' is another series where a silver-haired girl is involved in [[spoiler:a supernatural heart transplant]] that moves the plot forward.
** Another overarching plot point, namely the evil organization creating artificial humans, spreading a memory-affecting drug created from strange lifeforms to control students in a high school, and being in relation with a HumanAlien entity capable to be cloned, is a hefty reference to the ''LightNovel/BoogiepopSeries''. Hel also reminds of Boogiepop itself in her androgyny, cape, and being [[spoiler:the alternate personality of a troubled girl]], while Nagisa resembles Nagi Kirima in several aspects, and the appendages used by Bat are designed similar to how the 2019 ''Boogiepop'' anime portrayed the character of Eugene.
** The bioweapon monster is a giant wink to ''Franchise/ResidentEvil'', even having Nemesis' face on a body resembling a huge Licker. The description of Albert Coleman, a stylish, blond villain able to grow mutated tentacles who works for an evil organization that produces bioweapons, also fits Albert Wesker.
** Kimihito's house has some weird objects at the background, among them a tribal mask, when the female main character intrudes in his house and wears his clothing. This whole scene makes a subtle reference to ''LightNovel/CubeXCursedXCurious'', another light novel in the line of ''Gosick'' and ''Aria''.
** The usage of the word "siesta" (Spanish for nap) as a character name is likely a reference to yet another ShanaClone light novel, ''LightNovel/TheFamiliarOfZero''.