This is a very fun story that you can read quickly in one sitting. It's best enjoyed if you go into it more for the concept than the characters, and if you're relatively familiar with the way Lovecraft (who's a huge influence on Ito) constructs his stories. As with Lovecraft, the characters aren't that important (most of his stories have basically the same type of narrating protagonist), and are mostly one-dimensional and serve one purpose: to highlight the idea—which, in this case, is "how would humanity react to a planet-consuming alien organism approaching Earth?"
Of course, Ito puts his own cultural twist on it, with Remina Oguro being paraded around as an idol simply because of her coincidental name (to the profit of her talent agency), and with the cult-like fanaticism born out of both idolization and despair. It helps if you think of her as more of a pretext than a character; while she isn't responsible for the havoc that Hellstar Remina wreaks, humanity does, ironically, entrust her with their fate.
The art is much better than Ito's usual fare, simply because this, like Uzumaki, makes heavy use of landscapes. In general (aside from a few exceptions), Ito has very same-y character models and his backgrounds don't tend to get the spotlight much, but here we have many two-page spreads and separate panels to really take in the horrifying beauty of the Hellstar Remina. Quite the treat!
Once again: heavily recommended if you're a fan of Lovecraft and cosmic horror. I think you'll find it enjoyable, provided you aren't looking for a deep character- or hard logic-driven piece, and just want to see a good ol' insane Ito plot with a Lovecraftian flavor. Basically: don't think about it too hard, just sit back and enjoy the pulpy show.