There are only five of these uniquely beautiful necklaces, seemingly harmless to the random passer-by. With the charm the symbol of the Kobayashi Clan the cresent moon, the chain is made from Sakuya's birth father, Lord Zoku's silver hair. The girl uses these necklaces to track whoever she has given them to. She extracts a single drop of blood from the person, mixing it with her own, allowing her to track them when placed in the charm.