History Manga / Satanophany

* CorporateConspiracy: Officially speaking, Medusa Syndrome is a mysterious new mental illness that strikes seemingly ordinary young women and turns them into {{Serial Killer}}s. These murderers are then brought to specialized private prisons in order to treat them. In truth, a MegaCorp figured out some combination of drugs and VR that can effectively hack a person's mirror neurons to implant a new personality into them. So far, the "treatment" doesn't work on everybody, but women are more vulnerable to it due to having more mirror neurons. The MegaCorp provides the treatment to a very large number of women under false pretenses and then uses a FrameUp on the ones that show a reaction to use them as test subjects. The government is curiously unconcerned as to why so many prisoners die and why the prisoners only get worse.

* AntiHeroTeam: Of the NominalHero variety, since while the Medusas are all dangerous serial killers, they at least target even worse people.

* MenAreTheExpendableGender: During the SS Sanctuary Arc [[spoiler:of all the 35 members of Tendougumi aboard the ship, only the two women; Kyoko Kanzaki and Yan Bongfa survive. Riina Sudou also survives unharmed, but he had already defected to Kiriko's side and he's a WholesomeCrossdresser who decides to live as a woman.]]

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A mysterious syndrome turns schoolgirls into homicidal monsters behind numerous atrocities in Japan. However, nothing is what it seems and when Chika Amagi is arrested for the brutal murder of five people, a journey into uncharted, troubled waters begins!

A thriller, action, horror, mystery and drama manga by Yamada Yoshinobu, who also authored ''Manga/CageOfEden'' and ''Deathtopia''.

* AllMenArePerverts: Whenever they're not serial rapists or just depraved individuals, they're simply perving on women.

** Chika kills [[spoiler:Tomomi Mizuno by making him fall into a pole from a height of 4 stories until ''it comes out of his mouth'']]. Jeesh.

** Tomomi Mizuno is a Yakuza with an obsession with asses, and he'll rape anyone, be they male or female, if he likes their asses.

* MenAreTheExpendableGender: During the SS Sanctuary Arc [[spoiler:of all the 35 members of Tendougumi aboard the ship, only the two women; Kyoko Kanzaki and Yan Bongfa survive. Riina Sudou also survives unharmed, but he had already defected to Kiriko's side and he's a WholesomeCrossdresser.]]

* MythologyGag: Miina Isurugi can't help but notice the similarities between her and Niina Rudou, which fits since in ''Cage of Eden'', the former was the body double of the latter. [[spoiler:Even Niina's real sex inverts the one with Miina.]]
* NeckSnap: Medusas are strong enough to snap the neck of another person with surprising ease, either using their hands or their MurderousThighs.

* ReusedCharacterDesign: ''Satanophany'' reuses the design and even names of characters from previous works.

** [[spoiler:Katya admits she was raped by her father when she was younger.]]

** Karen Kirishima uses ''Moon-Maniac'' and notorious sadomasochist Albert Fisher. As such she's a CombatSadomasochist who uses a whip.

** Chika kills [[spoiler:Tomomi Mizuno by making him fall into a pole from a height of 4 stories until ''it comes out of his mouth]]. Jeesh.

** Chika Amagi is clearly based on Yui Kisaragi from ''Deathtopia'', who was in turn based on an older Rion Akagami from ''Cage of Eden''. The main difference is that she lacks Kisaragi's cowlick.
** Michitaka Amagi is based on an older Koh Fujimura, who was in turn based on an older Akira Sengoku. The main difference is that he needs glasses.

** Miina Isurugi is simply older than how she was in ''Cage of Eden'' [[spoiler:with the exception she's really female and not a cross dressing boy]].

* MistreatmentInducedBetrayal: [[spoiler:Jin Mizuno/Niina Sudou turns on his father Tomomi in favor of Kiriko, since he was tired of being anally raped by his father.]]
* MythologyGag: Miina Isurugi can't help but notice the similarities between her and Niina Sudou, which fits since in ''Cage of Eden'', the former was the body double of the latter. [[spoiler:Even Niina's real sex inverts the one with Miina.]]

* WholesomeCrossdresser: [[spoiler:Niina Sudou is a boy cross dressing as a girl, and he's the only member of Tendougumi who defects, mostly due to falling in love with Kiriko and taking her virginity.]]

* DeathBySex: Karen and Katya both dispose of two killers while they were in the middle of banging each other. In fact, they do this on two separate occasions.

* MistreatmentInducedBetrayal: [[spoiler:Jin Mizuno/Riina Sudou turns on his father Tomomi in favor of Kiriko, since he was tired of being anally raped by his father.]]

* ParentalIncest: [[spoiler:Katya admits she was raped by her father when she was younger.]]

* WholesomeCrossdresser: [[spoiler:Riina Sudou is a boy cross dressing as a girl, and he's the only member of Tendougumi who defects, mostly due to falling in love with Kiriko and taking her virginity.]]

* BaldOfEvil: Mizuno Tendougami is completely bald and he's a ruthless and depraved Yakuza with an obsession with asses.

* DeathBySex: Karen and Katya both dispose of two killers while they were in the middle of banging each other.

** Mizuno Tendougami is a Yakuza with an obsession with asses, and he'll rape anyone, be they male or female, if he likes their asses.
* EvenEvilHasStandards: Kanzaki might be a brutal enforcer and fighter, but even she finds Tendougami's disturbing obsession with asses to be distasteful.

* MistreatmentInducedBetrayal: [[spoiler:Jin Tendougami/Riina Sudou turns on his father in favor of Kiriko, since he was tired of being anally raped by his father.]]

* DepravedBisexual: Floyd King is a ScaryBlackMan who if he can't get his rape itch satisfied by a nearby woman, he'll rape a man instead.

* CastFullOfCrazy: Just for starters, the main characters have all been implanted with the personalities of infamous serial killers and sociopaths.