History Anime / ValkyrieDriveMermaid

* SpiritualSuccessor: The franchise is this to ''VideoGame/SenranKagura''. Both series feature busty girls, are heavy on fanservice with breasts being the main fetish and are conceptualized by the same creator. ''Mermaid'' ramps up the fanservice to another level.

%%* YuriGenre: One of the most blatant examples.

Girls infected with this virus are [[HoYay quarantined]] on [[PenalColony Mermaid Island]]. Mamori, a naive and sexually inexperienced teenaged girl, has been infected with the Extar strain and has been sent to the island as a consequence. Fortunately for her, she manages to find her Liberator -- a buxom badass named Mirei. The story follows these two as they navigate the authoritarian society of the island.

* SituationalSexuality:
** A disease that only affects women, granting superhuman abilities only when said women are sexually aroused? On a mechanical island forcefully separated from the rest of human society and men?

** A disease that only affects women, granting superhuman abilities only when said women are sexually aroused? On a mechanical island forcefully separated from the rest of human society and men? However, it is important to point out that every major character (and even some minor ones) are explicitly shown as being lesbians ''despite'' the disease not because of it.

Girls infected with this virus are [[HoYay quarantined]] on [[PenalColony Mermaid Island]]. Mamori, a naive and sexually-inexperienced teenaged girl, has been infected with the Extar strain and has been sent to the island as a consequence. Fortunately for her, she manages to find her Liberator -- a buxom badass named Mirei. The story follows these two as they navigate the authoritarian society of the island.

A [[PornWithPlot mysterious virus]] has swept the world. A virus that [[GirlOnGirlIsHot only affects girls]]. The Liberator strain of the virus provides increased speed, strength, and agility to those infected. The Extar strain of the virus will cause those infected to [[MagicGenetics physically transform into a weapon of some kind]] -- as long as they have been [[EmbarassingSuperpower sexually aroused by a girl infected with the Liberator strain]].

The series takes place on one of five artificial islands, Mermaid. Mamori is transferred to one of the islands but has no knowledge of why she's there. To make matters more confusing she's attacked by the first two people she comes across, [[EquippableAlly one of them even turning her partner into a gun]]. Fortunately, she's saved by Mirei, another girl who also just transferred to the island. Still their attackers won't let up and in order to save both of them Mirei kisses Mamori which transforms Mamori into a powerful sword.

* KickTheSonOfABitch: Charlotte breaks the defeated Saejima's hand by stomping it with her high heel [[YouHaveFailedMe after she lost to Mirei]]. Considering how cruel Saejima is to her Extar, it's kinda deserved.

'''''Valkyrie Drive: Mermaid''''' is the anime portion of Marvelous's ''Valkyrie Drive'' project. For the video game side, see the page for ''VideoGame/ValkyrieDriveBhikkhuni''.

* ADateWithRosiePalms: [[spoiler:In episode 4 Mamori thinks she's being fondled by Akira but it turns out to be an illusion from Miranda. She's actually just masturbating.]]

* {{Gainaxing}}:
** Even when they're not moving that much, there's quite the bounce to a lot of characters' breasts.
** Charlotte's breasts almost bounce out of her top just by walking.

* SpiritualSuccessor: The franchise is this to ''VideoGame/SenranKagura''. Both series feature busty girls, are heavy on fanservice with breasts being the main fetish and are conceptualized by the same creator. ''Mermaid'' ramps up the fanservice [[UpToEleven to another level]].

* ActressAllusion: Torino Kasami, who looks older but is 17, is voiced by Creator/KikukoInoue. Inoue sometimes addresses her age as "17 years old and X days" even though she clearly isn't.

* MoodWhiplash: The rapid switches from fanservice to epic fights can be this, but the later episodes fit even better; more than one finishes on [[CerebusSyndrome rather dark notes]] before segueing right into the ending song; the [[TastesLikeDiabetes disgustingly cheerful]] ''Super Ultra Hyper Miracle Romantic''.

* GovernmentConspiracy: Implied. Mamori is literally grabbed by TheMenInBlack [[AdultFear while she's on the track field of her public school.]] It's also implied that her parents knew this was coming but could do nothing about it when the results of her annual medical exam showed "an irregularity."

* ImmodestOrgasm: A lot of Extars usually let out a loud moan when being transformed.

* ActorAllusion: Torino Kasami, who looks older but is 17, is voiced by Creator/KikukoInoue. Inoue sometimes addresses her age as "17 years old and X days" even though she clearly isn't.

* YoungerThanTheyLook: Mirei, who is taller, more developed and deeper sounding than Mamori, is only fifteen years old, one year ''younger'' than Mamori.
* YuriGenre: One of the most blatant examples.

* BeginnersLuck: Not long after awakening as an Extar and Liberator, Mamori and Mirei have already defeated other Extars and Liberators with far more experience than them. Subverted since Mirei is [[spoiler:actually an experienced Liberator.]]

%%** RecycledInSPACE: By extension, this is basically ''VideoGame/SenranKagura'' that is high on [[YuriGenre yuri]].

* SchoolgirlLesbians: Pretty well everyone in the series.

* {{Ecchi}}: One of the most extreme examples created, threading dangerously close to PornWithPlot.

* ADateWithRosiePalms: [[spoiler:In episode 4 Mamori thinks she's being fondled by Akira but it turns out to be an illusion from Miranda. She's actually just masturbating.]]

** Kasumi somehow shreds her own pantyhose kicking Mirei.