Lunar Legend Tsukihime is a series about Shiki Tohno, who sustained a life threatening injury as a child, and due to that incident he was sent away from the Tohno household and was given to a relative to be raised. Years later, the head of the Tohno household--his father--dies, and he is ordered to move back in by his sister Akiha, who is the new head of the household.
However, Shiki holds a huge secret. Ever since that injury, he has been seeing lines on objects, and only with a special pair of glasses is he able to stop seeing them. Also he is unable to remember anything well from the time before his accident. Nevertheless, those people he meets from this point forward and those of his past will all come together in time, and all secrets will be revealedů