A Winter of Ghosts

"Kara's life in Japanese prep school has been a whirlwind of terror, as a demon's curse keeps waking up ancient, evil creatures to torment her and her friends. When a student goes missing during a visit to a mountain forest, Kara and her friends are sure the curse has struck again. This time, it's a demon of winter, whose power is more chilling than anything they've encountered so far. And then it gets worse: the demon kidnaps Kara's boyfriend, Hachiro, with whom she's just starting to fall in love. Desperate to save him, Kara ventures back into the snowy woods, where dark forces await her ..." — quoted from this books Amazon.com product page as of 2013-04-16.