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Dragon Knight III is an eroge role-playing video game released on many Japanese PCs in 1991. It is part of the Dragon Knight series of games created by Japanese game developer ELF, who originally released the game for the NEC PC-9801 computer in 1991, followed by ports for the Sharp X68000 and PC Engine CD platforms. The game is a sequel of Dragon Knight and Dragon Knight II. Its gameplay system is different from that of previous installments of the Dragon Knight series, resembling this of the early Final Fantasy (even more in the PC version) series instead of first-person-view dungeon crawler, and enabling the player to explore the entire world of the game. Some of the characters were renamed in the English and German localized Knights of Xentar release, including the protagonist Takeru's name changed to Desmond.

The Dragon Master, Darklarza, has been terrorizing the kingdom for many years. The king was forced into exile by this threat. He retreated, with the bravest knight in the kingdom, named Garaden. Darklarza stages an attack on the king's fortress, breaks in and manages to abduct the royal princess. Garaden sets off to vanquish Darklarza and rescue the princess. Dragon Knight marked the beginning of Elf's erotic RPG series. The game is played entirely from a first-person perspective. In the town, you move around by selecting destinations from a menu. Once you enter the tower, you navigate your character through 3D mazes, fighting random enemies in turn-based combat. Enemies in the game are scantily clad, attractive young women; there are also several scenes with explicit nudity.

Seiko-chan was caught in the robot kingdom and it’s up to you to rescue her from being brainwashed. Robots appear one at a time in a large rectangular arena. They are stationary when they appear, but can randomly and suddenly teleport to other parts of the screen. You control a cross-hair, that you can use to target and shoot the robot, which is only vulnerable in the chest area.

One of Kōei's first video games, Night Life (1982) was the first Japanese commercial erotic game to hit the market, featuring a series of sexually explicit images, and marketed as a tool to help couples enhance their sex life. An intercourse simulator and part of Kōei's Strawberry Porno series, Night Life is considered to be a precursor for the Bishōjo game genre. In-game, the player has a limited set of options, including determining the date of a woman's period, a choice of sex positions and the option of how much time to allocate to each one. The intercourse is then displayed on the screen through the 'Let's Fuck' option, and is non-interactive.

Released in June 1985, Tenshitachi no Gogo (Afternoon of Angels) this was one of the first adult dating sims, an adventure game set in a Japanese high school. The goal is to seduce the star girl of the tennis club, Yumiko Shiraishi. To do this, the player needs to go around talking with her friends and possibly getting intimate with them as well.

Dragon Knight II is the predecessor to Knights of Xentar, the only Dragon Knight game that was ever translated into English. This is a first-person game that is mainly dedicated to dungeon exploring. Takeru has to explore the three dungeons, fighting enemies and sometimes talking to dungeon inhabitants. The enemies are the girls who were turned into monsters by Mesaana. In town, Takeru can also buy weapons, armor, and items, and talk to various people.

177 is the number of the Japanese criminal legislation paragraph that forbids rape. The game, however, does just the opposite: it puts the player in control of a man who must pursue a fleeing young girl and rape her. The game has two gameplay modes. The first is a side-scrolling arcade sequence during which the player has to prevent the girl from reaching her house, and avoid the hazards on the protagonist's way. These include stones, barriers, animals such as dogs and turtles, etc., and can be avoided by destroying or jumping over them. The protagonist runs automatically, but the player can increase or decrease the distance between him and the running girl. In order to make the girl choose the wrong way and fail to find her house, the protagonist throws stones at her (these can also be used to kill animals and destroy obstacles). After the protagonist has caught the girl, the game switches into sex simulation. The player pushes arrow keys in a specific order to correspond with the protagonist's movements. The goal is to sexually satisfy the girl. If the player fails, the protagonist is arrested; if he succeeds, the girl marries the protagonist.

Angel Hearts is a dead simple RPG developed by ELF in 1989. The gameplay resembles that of "dungeon crawlers", meaning that there are no friendly areas; though the view for exploration is top-down rather than first-person (which is reserved for the turn-based battles). The gameplay mechanics are mostly confined to fighting random enemies and earning enough experience points to go up a level and standing a chance against the next "boss" enemy. There is no equipment system, and battle commands are restricted to "Attack", "Escape", and "Item".