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One free option would be Sepia Tears (Google Play link). It is a pretty good free romance VN in English. At the beginning of it, it seemed fairly generic, but I did like how the story progressed.
Other than that, there is Everlasting Summer (Google Play link). I have only installed this and haven't started playing it yet, but have heard good things. It is a VN originally written in Russian. If it is your kind of thing, there is a patch that restores the h-scenes on their website.