Moonstone is a
Japanese visual novel studio known for creating
adult-oriented
bishojo games. The founding members of Moonstone had once been members of
Circus, a similar visual novel studio. After the establishment of Moonstone, a collaboration project between Moonstone and Circus was set up for Circus' game
Suika AS+, and then another collaboration project between the two companies was set up for Moonstone's game
Gift. On 2009 Moonstone established the sub-brand Moonstone Cherry, which focuses on
nukige titles.