Really, this show is climbing up to be my most favorite of the season. For one, Ayumu is probably my favorite male lead this season. She's not as oblivious to love or unusually celibate like the usual harem lead, here we can see him peeking at girls in PE uniform and even having 'dere vision' as well as wanting to be called onii-chan. But what I like about him is he seems like teenage boys his age - a bit shy when approaching girls, and ending up making a fool of himself (really, that UFO line will probably only work on Haruhi - his rapping breakdance is so bad it's hilarious though). Added with a good degree of savviness (pretty much understands Haruna's behavior) and good sense of humour, he's also pretty good in a fight thanks to him being a zombie.
Speaking of which, the fight is really awesome too, I'm impressed by Sera. That whole turning to leaf / leaf blade is pretty cool, and the vampire wing at the end is pretty cool as well. She seems like a good addition, a bit too harsh for my liking but the red dress she wears at the end of the episode looks really good on her.
Lastly, there's Yuu. Thanks to the flashback to how she met him, she's currently my favorite girl. I guess I just liked kuudere? But I like the moments when her emotions shows, like that small smile she gave Ayumu, or when she slapped Haruna. Personally I'm with her, I never liked it when people joked with death, although I'm assuming since she's a necromancer and all that, she may have a deeper reason than that? Can't wait for next episode, the episode title alone should interest mangatron and Himeji