Maybe you can even go as far as to create a story in which the two people are more than just casual acquaintances at the beginning.
If the game is a simulation, and the Official Couple continues their relationship, then your game could emphasize time management and making friends.
Likewise, many commercial games have a Slice of Life setting.
If your setting is realistic, then make sure you can portray it in a way that the audience will find interesting.
Note that harems do not necessarily exist in doujin visual novels.Or perhaps you want to mix some relationship elements into your mainstream video game. The first decision you make will unlock a major Event Flag for your story/game: If you're not creating a product with the intention of selling it, then know what you're getting into.Do not talk about your awesome plans until your project is almost finished.If you have decided to create an adult game, then you need to decide how sex will be incorporated into the story or the gameplay.You can include hardcore scenes at important moments.