Otogirisou was a standard adventure game but had multiple endings. In 1996, the new software publisher Leaf expanded on this idea, calling it a visual novel and releasing their first successful game, Shizuku, a horror story starring a rapist high school student, with very highly reviewed writing and music. However, in 1997, they released To Heart, a sweetly sentimental story of high school love that became one of the most famous and trendsetting eroge ever.
To Heart's music was so popular it was added to karaoke machines throughout Japan—a first for eroge.
From turn-based strategy and tower defense to clickers and RPGs, all games have a porn element added to them.Oftentimes, voice actors who have voiced for eroge have been credited under a pseudonym.There is no set definition for the gameplay of eroge, except that they all include explicit sexual content.According to Satoshi Todome's A History of Eroge, Kanon is still the standard for modern eroge and is referred to as a "baptism" for young otaku in Japan.Although many eroge still market themselves primarily on sex, eroge that focus on story are now a major established part of Japanese otaku culture.