Eroge

Eroge, also known as erotic games, have their origins in the early 1980s, when Japanese companies introduced their own brands of microcomputer to compete with those of the United States. The earliest known commercial erotic computer game is PSK's Lolita Yakyūken, released in 1982. That same year, Koei released the erotic title, Seduction of the Condominium Wife (団地妻の誘惑, Danchi Tsuma no Yūwaku), which was an early role-playing adventure game with color graphics, owing to the eight-color palette of the PC-8001 computer. It became a hit, helping Koei become a major software company.

In another opinion, Yuji Horii recalled in 1986 that he saw a demonstration of a Yakyūken-like game running on the FM-8 in the end of 1981, and he considered Yakyūken was the origin of adult games. Some writers say that Yakyūken produced for Sharp MZ computers by Hudson Soft is the first Japanese adult game.

In some of the early erotic games, the erotic content is meaningfully integrated into a thoughtful and mature storytelling, though others often used it as a flimsy excuse for pornography. As the visual novel standard was adopted, the erotic parts in eroge began to become less and less apparent. Many eroge become more story-oriented than sex-oriented, making story the main focus for many modern eroge. More and more people who used to reject such type of games began to become more open-minded, realizing that eroge are not just about sex anymore. Some story-focused eroge tend to have only a few erotic scenes.