The main character Tohno Shiki, was involved in a large accident in his childhood. He was severely injured that it was thought he was dead, but miraculously survived. However, due to that incident, Shiki is sent away from the Tohno household, and is entrusted into the care of a distant relative's family.
There was a secret to Shiki. Ever since the accident -- lines at which things break easily could be seen. If a blade could be passed through the line, anything could easily be severed.
Troubled with this ability, young Shiki is given a pair of glasses by a lady he meets (Shiki calls her "Teacher"), which stops the "lines of death" from being seen. Thanks to that, Shiki was able to live normally up until now. And he was planned to live normally from now on too.
But then, a letter to Shiki arrives. The head of the Tohno Household's - his father's - died. By orders of the new head of the household, he must return at once to the Tohno house.
This story begins when Shiki, now a High School Student, returns to the Tohno Household.
Hannah's comments: Quite sad series, but not as sad as for instance Berserk. Very nice animation!! Ok background music. I didn't know from the beginning that this series was about Vampires and "people who get crazy , when there is full moon" .