Tsukihime

This story is about a young boy named Tohno Shiki who, after experiencing a traumatic accident, wakes up in the hospital with the ability to see lines and cracks in every surface and being. These lines, when traced with any sharp or blunt edge, will be permanently cut.

As he is forced to see these lines everywhere, Shiki is distraught until he meets a mage girl who gives him glasses that allow him to live a normal life.