After playing a bit more, during gameplay they do seem to show in decent amount (but no way to force them). But after winning the game, they look to be very rare occurrence.
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Is it possible for you to share exact logic on how in next image decided?
Does it pick a girl first, and then pick an image for it (including any composites they can show). What decides if old composites, or new wide group composites, will be shown? Do they have independent chance to show, or are also tied to a girl? What about finales?