Nihon Falcom
Like with Koei, several other now-famous Japanese companies such as Enix, Square and Nihon Falcom also released erotic adult games for the PC-8801 computer in the early 1980s before they became mainstream. Early eroge usually had simplistic stories and extreme sexual content, such as rape and lolicon. In some of the early erotic games, the erotic content is meaningfully integrated into a thoughtful and mature storyline, though others often used it as simply an excuse for pornography.