La Blue Girl is the most infamous hentai series EVER. From the original, #4 is the best.
The sequel "Lady Blue" isn't as good because unlike the original, it actually tries to tell a story among its 4 eps and fails.
The latest one, "La Blue Girl Returns", is what I'd consider the best of the three series, since it perfectly balances the story and the sex scenes while having fun at the same time. Plus, they totally pimp Nin Nin. Sadly, ep 4 ends on a cliffhanger and no future eps to conclude the series have been announced as of yet...
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