Because of vague definitions of what constitutes an "erotic game", there are several possible candidates for the first "eroge". If the definition applies to adult themes, the first game was "Softporn Adventure". Released in America in 1981 for the Apple II, this was a text-based comedic game from On-Line Systems. If "eroge" is defined as the first graphical depictions or Japanese adult themes, it would be Koei's 1982 release of "Night Life". Sexual intercourse is depicted through simple graphic outlines. Notably, "Night Life" was not intended to be erotic so much as an instructional guide "to support married life". A series of "undressing" games appeared as early as 1983, such as "Strip Mahjong". The first anime-styled erotic game was "Tenshitachi no Gogo", released in 1985 by JAST. In 1988, ASCII released the first erotic role-playing game, "Chaos Angel". In 1989, AliceSoft released the turn-based role-playing game "Rance" and ELF released "Dragon Knight".