First off, thanks again for the mass release. You even got one chapter over the latest RAWs i read, so fireworks salute to the team!
Secondly, Shirozaka is too much his type, so yeah, sadly, she's out of the running for who ultimately prevails if this isn't a harem ending, which I can't imagine it is. Akira's not that sophisticated - some heartache is headed his way when this reaches a final conclusion. Until then, be like Asahino and have more Ecchi fun.
I'm constantly giggling about Asahino's outrage that plap x3 was getting some and she wasn't. It's like her ego can't imagine some peasant is getting railed and she's left in the dust. HI.LA.RIOUS.
She is possessive of Akira though, through and through. I was taken aback in the chapter where she nibbles her ear while the others were gaming. That's probably the most redeeming thing about Futaba - she knows he's a good catch and she's not gonna let someone snag him as long as she's around.