The manga's story centers around Nagi-sama, a goddess who come to life before an art student when he carves a statue from a Kannagi tree. The anime version just premiered in Japan in October, and fervent interest among the most hardcore fans have led to high prices for even fan club cards. However, the anime has been partially overshadowed by fan controversy over a recent revelation in the manga's installment in the December issue, which was released last month.
Source: 2ch