Ah I finally listened to this thing :3
Some general comments:
Asami Abe seems to be no doubt the worst singer in SINA; she sounded like she was dying especially during the final moments of Akai Freesia.

But no hate. You know I actually find bad singing cute, so yeah. I just wish I could see her perhaps suffering face during it, too, it would be even cuter that way ^__^
Nana sounds awesome when her voice isn't cracking

, that seems to happen during any somewhat higher notes that she tries to push out. So she needs practice, but when her voice isn't cracking it really is very very nice, and 15. 涙、止まれ! (Namida, Tomare!) was one of my favourites here (her voice only cracked once in that, I think!!)
Ai Suma sounds like she could join Melon Kinenbi xD Hmm her tone of voice doesn't stand out a lot to me but she seems to be pretty good, perhaps the 2nd best in SINA.
Manami's great, I expected nothing less of her. Maybe sounds a bit weird for H!P songs since most of them are made for high cute voices, but yeah. Wub her singing~ 4. 愛のバカやろう (Ai no Bakayarou) is also a difficult song to sing but she did about as well as anyone can, so hooray o/
Nocchi was good, except for those anime songs that pretty much require shout-singing o-o;; So I didn't like those parts where she was half-singing half-shouting (with her voice cracking at times), but otherwise she did okay. I especially liked 13. 魂のルフラン (Tamashii no Rufuran) - at first I couldn't even believe it was her, she sounded so different (well the song was very different from H!P stuff). But yeah, great effort :3
Oh and then little Yui... Her voice was so cute and anime-ish, I couldn't help but smile while listening. Too cute. ;-; I won't really pay too much attention to these new girls unless they join Eggs or sth, but I'd like to hear more of this girl's singing. lol!
In the end, pretty good stuff. Some horrid vocal moments, but yeah. I'd love to see this plz. *glares at UFA*