Both movies are about a girl who is detached from the world and doesn't really give much for anything but herself and her possessions (or so it may seem). They have a chance-encounter and things take a turn, for Lui it being stuck in a weird love-triangle, for Rio it might just be the strange relationship she got herself into not knowing if this is 'it'. They're both kind of indie movies, not your everyday cookies, with a good dash of psychology in them. You shouldn't shy away from some adult themes in both movies.
I dunno why but these movies feel similar to me. So much feels watching the two. The feeling of falling in love and wanting to be happy but because of the situation, it felt impossible. It's kind of sad, and not in a depressing way, but in a way where your heart feels warm and you just can't help but cry... I can't explain exactly, just watch!