"A flower blooms in the world that's only filled with thorns..." Young lady from London, Katherine O'Sulivan and count Shiro Akira, the pure blooded vampire. Love connects them with an unbreakable bond, but will Shiro's strict world accept their love? And won't the approaching great danger separate this pair of lovers?

Future Tokio, Japan, an alternate universe where demons roam the streets and hunt humans... A demon hunter and yokai he was hired to kill are crossing their paths and it changes their lives completely... But in the background there is also a new danger arising - a powerful foe that wants to wipe out the whole humanity - and to defeat it our hunter and a yokai will have to join forces.