Kaoruko Mochizuki runs an herb shop in a small seaside town. One day, a mysterious man dressed in black named Kaname Hibiki enters her shop and reveals that Kaoruko is actually a witch. And what's more, Kaoruko needs Kaname to help control her awakening power!

Among the shocking news that Kaname imparts is that Kaoruko's mother is still alive and has entrusted Kaoruko with the immense power of the Witch Queen. As long as Kaoruko has that power, she will be the target of humans and demonic spirits alike. Kaname claims to be a "knight" that protects witches, but then he steals a kiss from Kaoruko...!