When Kanata takes a dare to ring a bell in an abandoned church, he doesn't expect anything to come of it—and certainly doesn't expect to meet a vampire! The vampire, Titi, and Kanata soon find out that the two of them have become part of a "sequence," a spell that binds their lives together.

Sequence had one volume published in English by Tokyopop on February 7, 2006. The publisher later became defunct.