User blog comment:Uondarando/Episodes/@comment-1044263-20110705193224

According to Anime News Network (and they're usually right), there will be 24 episodes. Makes sense really, one season is most of the time a multiple of 12 (12, 24 or even 36). Source: http://www.animenewsnetwork.com/encyclopedia/anime.php?id=12210&page=25