OverviewD.O. is a Japanese software company that focuses on developing and publishing hentai games. The company started releasing games in 1987, adopting the D.O. (short for "Digital Object") brand in 1989.
D.O. released adult games in various genres (e.g. the Branmarker role-playing game series), but is mostly familiar to the Western audience through its visual novels, such as Kana: Little Sister (1999).
In May 2009, following a three-year period during which they were not developing games, D.O. was integrated into Contents Traffic, the parent company of ZyX.
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- D.O. Corp. -- The Official homepage