Valkyrie Drive is a Japanese anime media franchise created by Marvelous, which was announced at the AnimeJapan convention in March 2015. The franchise consists of three projects; Mermaid , an anime television series produced by Arms Corporation, which aired in Japan from October to December 2015; Bhikkhuni , 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 , a social game for iOS and Android devices released in December 2015.