Mermaid follows an Extar named Mamori Tokonome who forms a partnership with the Liberator Mirei Shikishima.

These girls are brought to separate islands to spend their days completely isolated from the rest of the world until the islands' Observers, authorized by the government Organisation AAA, ostensibly deem them ready to rejoin society again. These girls are divided into two classes Extars ( エクスター, Ekusutā), who can transform into weapons when sexually aroused, and Liberators ( リブレイター, Ribureitā), who have the power to wield an Extar's weapon form, known as Liberator Arms, through a process known as Drive. Plot Įach of the series revolves around girls who have been infected with a mysterious virus known as the A Virus (Armed Virus).

The franchise consists of three projects Mermaid ( マーメイド, Māmeido), an anime television series produced by Arms Corporation, which aired in Japan from October to December 2015 Bhikkhuni ( ビクニ, Bikuni ), a PlayStation Vita game released on Decemin Japan with a Western release in 2016 and a Microsoft Windows version in 2017 and Siren ( セイレーン, Seirēn), a social game for iOS and Android devices released in December 2015. Valkyrie Drive ( ヴァルキリードライヴ, Varukirī Doraivu) is a Japanese media franchise created by Marvelous, which was announced at the AnimeJapan convention in March 2015.

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