Seishiro Sakurazuka (Japanese: 桜塚 星史郎, Hepburn: Sakurazuka Seishirō) is a fictional character that was created by Clamp and first appeared in the manga Tokyo Babylon. He appears as a kind veterinarian who shows romantic affection for the young exorcist (referred as onmyoji) Subaru Sumeragi. During the story, it is revealed he is the Sakurazukamori (桜塚護, lit. "Cherry Blossom burial mound guardian"), Japan's number-one assassin who is targeting Subaru. The character returns in the apocalyptic manga X as a combatant in the battle of Armageddon, a Dragon of Earth and Subaru's rival. An alternative version of Seishiro appears in Clamp's crossover series Tsubasa: Reservoir Chronicle as a young treasure hunter who is searching for two vampires.