is a 3D anime-style character creator and dating sim developed by Illusion (now defunct). It is widely known for its extensive customization and modding community, particularly around Koikatsu Party (the Steam version) and Koikatsu Sunshine .

: In Koikatsu, BepInEx is the first thing that loads. It initializes the environment so that all other mods (like character creators or story enhancements) can function. Essential Plugins & Modding

– There is no known official or widely used term in the Koikatsu community called "bepi." It could be: