Recently, Grisaia Phantom Trigger Vol.1 and 2 got released on Steam. The game is a visual novel part of the Grisaia series and is about an academy training students for battle in the name of national defense. Both volumes 1 and 2 prices are $14.99 or ¥1671.61. For more details, check out the store pages. Here's a trailer.
Vol.1 Steam: http://store.steampowered.com/app/606510/
Vol.2 Steam: http://store.steampowered.com/app/606520/
Official Website: http://grisaia-pt.com/