Lunar Legend Tsukihime

Shiki Toono wakes up in a hospital with the strange ability to see invisible lines-thin threads that form the structure of all things in Shingetsutan. Cutting these lines causes objects to instantly crumble, and Shiki realizes that tracing them leads to destruction. He keeps this power hidden and tries to live an ordinary life as a high school sophomore. But his peace is shattered when he meets a woman with striking red eyes on his way home. In a sudden fit of madness, he seemingly kills her before collapsing. The next day, demonic hounds attack Shiki, and just as death seems inevitable, the woman he thought he killed saves him. She reveals herself as Arcueid Brunestud, a vampire princess. Forced together by fate, Shiki and Arcueid join forces to unravel the mysteries of their past and the disturbing murders plaguing the town.