Typical setup episode you would expect to find right before the end. Everyone gathers together and prepares for the final attack. Haru confirms that Koko is actually alive, so she’ll definitely come back. The boat captain gets hit with a missile, but the show doesn’t strike me as the kind to let characters die, so I figure he’ll be fine as well.
Things look pretty straightforward from here. They’ll go out and fish the big bad out of the water. Theoretically, there’d be something interesting that gets in the way, but I doubt I could guess it. Honestly, I don’t think that this other alien is explained very well, but I’ll wait until the end to judge it.