Throughout the nineties, bishōjo games underwent an evolution from being one of the most technologically demanding types of games (because their detailed 2D graphics required a large amount of storage space by the standards of early computers) to one of the least (they rarely use 3D graphics).
Thus, more than regular games, the main employees required by bishōjo game companies today are not programmers but artists and writers.
However, it was unique in that it contained not only adventure-game elements but also a combat system borrowed from tactical combat games such as Tactics Ogre.
Since the late nineties, there has been a trend towards better storytelling in mainstream bishōjo games.
Prior to 1985, girls were generally drawn either as normally proportioned adults or super deformed children.
Some games involved elements of force and brutality.
In 2001 Tokimeki Memorial 3 became the first bishojo game to break this trend.
However, low sales make it likely that other companies will stick with the traditional 2D graphics.
Some of the least pornographic and most successful also branching off into the console market.
Thus free from controversy and fueled by continuing improvement in technology, in the 1990s the bishōjo game industry underwent a decade-long boom.
The first major title of the 1990s was Tokimeki Memorial.
Bishōjo games are similar to Choose Your Own Adventure books in the way of narrative, in which the game tells a story but the player may make choices to change how the story flows. Bishōjo games began to appear in Japan in the beginning days of personal computers.
The first bishōjo game commercialized in Japan appeared in 1982 as Night Life by Koei.