God, I love Kei. He is just the right mix of coward, scumbag, relatable teen and actual hero with balls of steel. I don't see that girl living for very long, and I suspect Kei won't be too distraught by her death either. And although I expect the reveal about the nature of Gantz or the aliens to be kind of dumb... I am so excited for it, too. The story is surprisingly interesting, especially for such an action-focused slaughter fest.
/edit: I also forgot, what's up with the one SWAT guy having seen his gun? It didn't trigger the head explosion, which was expected. Because it didn't immediately kill one of the gang members earlier either. But the SWAT guy just immediately dropped the topic as if he didn't see it to begin with. But guns are illegal in Japan! Was this supposed to be a weird "bro" moment, where the guy is like "I won't tell 'em, because you did a good job killing that alien fucker", is it going to actually be brought up again soon or is there a mind manipulation / perception filter going on? I guess we'll see. But I want to mention it just in case I massively misunderstood that scene. :P