鎮花祭－はなしずめのまつり－

Main character comes from a Shinto priest family. One day he encounters a strange girl in his dream, and from then on bizarre incidents started to happen around him - first a tremendous blood stain appears on the school building, then a series of girl violence and kidnapping cases start to happen. It's almost the time for an ancient festival held since ancient times to calm the disasters. Something is bound to happen.

[From vndbreview]