It seems like I'm a minority here. I dislike Kazuma...a lot. His cockiness is really, really aggravating, and he seems a little bit too perfect. He set a record for me: I wanted to punch his face in by the end of the first episode, which is two episodes faster than Kyoshiro (of Kyoshiro to Towa no Sora). At this point, I still like him more than Kyoshiro since Kazuma showed concern for his little brother.
I loved the hearts Ren gave off in the second episode. He gives me Tamaki vibes.
