If your zip is part of a "Repack," you usually need to run InitSetting.exe or the included launcher to "generate" the correct configuration for your PC. コイカツ！ / Koikatsu Party on Steam
You can use this as inspiration for a scene in or as a "card" concept: Scene: The After-School Clubroom File: Koikatsu.Party-FREEDRM.zip ...
The sunlight is filtering through the windows at a low angle, casting long shadows across the wooden floorboards. The room is quiet, except for the faint sound of a distant soccer practice. Characters: If your zip is part of a "Repack,"
Standing by the window, looking out at the courtyard, perhaps waiting for the right moment to speak. Characters: Standing by the window, looking out at
You can find thousands of community-made "pieces" (character cards) on sites like Sankaku Complex or Pixiv . Just drop the .png files into your UserData/chara/female folder to "generate" them in your game.
Title: コイカツ！ / Koikatsu Party. Genre: Simulation. Developer: ILLUSION. Publisher: ILLUSION. Release Date: Jun 10, 2019.
Since you’ve mentioned —a game famous for its extremely deep anime character creator and studio mode—and asked to "generate a piece," I've put together a short, stylized scene description that captures the typical "slice-of-life" vibe of the game.