Claim: Valkyrie Drive is a Japanese media franchise created by Marvelous that consists of three projects that revolve around girls who have been infected with a mysterious virus that allows them to transform into weapons.
Evidence: Valkyrie Drive (ヴァルキリードライヴ, Varukirī Doraivu) is a Japanese media franchise created by Marvelous, which was announced at the AnimeJapan convention in March 2015. The franchise consists of three projects; Mermaid (マーメイド, Māmeido), an anime television series produced by Arms Corporation, which aired in Japan between October and December 2015; Bhikkhuni (ビクニ, Bikuni), a PlayStation Vita game released on December 10, 2015 in 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. Each of the series revolves around girls who have been infected with a mysterious virus known as the A Virus (Armed Virus). These girls are divided into two classes; Extars (エクスター, Ekusutā), who can transform into weapons when sexually aroused, and Liberators (リブレイター, Ribureitā), who have the power to wield an Extar's weapon form, known as Liberator Arms, through a process known as Drive.