Some Japanese dating sims may allow the player to have romantic or sexual relationships with characters in their teens.
When the game ends, the player either loses the game if he failed to properly win over any of the girls, or "finishes" one of the girls, often by having sex with her, marrying her (as in Magical Date), and/or achieving eternal love.
This gives the games more replay value, since the player can focus on a different girl each time, trying to get a different ending.
The gameplay involves conversing with a selection of girls, attempting to increase their internal "love meter" through correct choices of dialogue.
The game lasts for a fixed period of game time, such as one month or three years.