: In the first five days, always choose dialogue that shows support rather than being pushy. This unlocks the "Best Friend" path, which is required for the harem ending.
Developers like Dumb Koala often release for free a few months after they have been available to their paid Patreon or Fanbox supporters.
The game will likely ask for storage permission (to save your progress) and possibly notifications. Grant them for the best experience.