Ordinary High School Girl Jina discovers that she us heir to a terrible legacy handed down from her family's sinister history. Long ago, her family killed a magical serpent known as an Imugi, believing it would give them good luck. Unfortunately, the creature cursed them as it died, decreeing that one familt member of each generation will be killed by two people closely aquainted with that person. In this day and age, no one wants to believe in such outmoded superstitions, but one of Jina's relatives have been killed in every generation. Now, she has been told she will be next to die....