Yeah you play as Yuuki but really it's like the female is Yuuki because you change the name etc.
Yup! I already did Shiki Senri's route *dokidoki* I wanted to do Zero's but then I misplaced the file and had to start all over again so now I'm doing Kaname Kuran. The others are Ichijo, Aido, Kain, Zero and even...Yagari O.O
I'm assuming the game takes you as the role of the female lead of the anime, and you can choose who you want to be with form one of the male characters (Kanade, Zero, Aidou, etc, etc) judging from how many males there are in the anime/manga.