https://www.lewdgamer.com/2016/02/29/valkyrie-drive-siren-breakout-chapter-02/

Lewd Gamer has also translated the prologue and the first chapter

https://www.lewdgamer.com/2015/12/04/valkyrie-drive-siren-breakout-chapter-00/

https://www.lewdgamer.com/2016/01/12/16426/

Hopefully they will continue translating the series.