If anything, you should play Kira*Kira and Kira*Kira Curtain Call first. Granted, it won't hurt if you play them later, but Deardrops and Curtain Call follow the true route, which you have to do the other good endings for.
Also, I know Z3N0N said something about mostly-female casts, but I stand by my suggestion of Hanasaku Iroha.