Mizu no Senritsu

Shiraishi Hina, a second-year schoolgirl, one day finds strange incidents happening to her, from being pushed down the stairs to having wild dogs attack her. At night, a mysterious elderly woman speaks to her in her dreams.
Hina soon finds herself caught in a war between two supernatural human races.

Mizu no Senritsu is an otome game, developed and published by Kid, which was released in Japan in 2005.