When First Girl Wins is not in effect, the most likely girl to win the heart of the male protagonist at the end of a harem anime is the last girl we meet in the series.
In harem series, it's usually the first potential love interest you see that wins the heart of the Unlucky Everydude. This is for a simple reason: she makes a strong impression this way, and we aren't blindsided.
But there's [...] [tvtropes.org]