I've always had a soft spot for Ryoko Shiraishi voiced tomboys. A lot of people probably associate her with Hayate the Combat Butler, but she'll always be Chiaki from Tenjou Tenge to me. (Rin from Airantou and Kaede from Negima too). That said, Kanako is probably my favorite for now, she's cutely possessive of Kosaka.

I wasn't planning on watching this, but the humor is pretty good.