hi, most of the scenes are available regardless of the waifu choice, but as the game's development progresses forward there will be more waifu-related content to keep the immersion and flow of the story. There's an option to start any chapter via Select plot / chapter option, and when starting the chapter this way it's possible to choose a waifu at the beginning. If you want to skip playing the chapters with different waifu you can activate cheats and unlock the memories, which will open all the major scenes in the game.