 If you liked
Video Girl Ai
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 ...then you might like
Kobato.
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Both deal with ephemeral or liminal girls who fall in love with tragic male protagonists who both realize almost too late that the girl who was in front of them the whole time was the one they truly love. Both have fairly sad final plot arcs, but Video Girl Ai is more grimdark, whereas Kobato's offers more hope/a second chance in it's epilogue.