Season 1

Shiki Tohno, an ordinary high school student, begins another routine day only to learn of a recent murder at his school, the victim bearing what appear to be vampire marks on the neck. During the day he has a strange encounter with a girl named Ciel, who seems to be his friend, yet he cannot remember her. On his way home he experiences a daydream of killing a girl he sees. He wakes up in his sister's mansion, the home he is moving into that day, and meets two maids who tell him he can't go out past 7 pm. Bored, he sneaks out to get magazines. On his way back he finds a man collapsed with teeth marks on his neck and also sees a sword-wielding girl who resembles Ciel. Confused, he passes out. He wakes the next morning in his room again; reading the newspaper reveals nothing about the incident, leading him to believe it was only a dream. His sister discovers that he sneaked out. On his way to school, he runs into the mysterious girl from the dream.