Shingetsutan Tsukihime

Shiki Tohno, a high school student with a fractured past, returns to his estranged family home after the death of his father. Plagued by fragmented memories and a strange ability to see deadly "lines" on everything around him, Shiki's reality is upended when a chance encounter with the enigmatic and powerful Arcueid Brunestud triggers a violent, irreversible event.

Thrust into a shadowy world of supernatural beings and ancient bloodlines, Shiki becomes Arcueid's reluctant protector. Together, they navigate a dangerous web of mysteries, where Shiki's forgotten childhood, his eerie power, and the true nature of the Tohno household begin to horrifyingly intertwine. This atmospheric anime masterfully blends urban fantasy, psychological horror, and dark romance as Shiki fights to uncover the truth before it consumes him.