An enjoyable girl adventure series that mixes four cute protagonists and girlfriend relationship problems in with science fiction and military battle action. Don't expect any deep sci-fi plot material here, but the underlying story is mildly interesting in that it follows the well-worn theme of battling invaders from parallel universes, with some general storyline similarities to the Mai-Hime, Yumeria or Noein series. The story was somewhat remarkable for what it didn't have: no boys or male love interests, almost no comedy or humor. All in all, Vividred was a pretty light feel-good series with more than a few fan service moments.