Sono wa Fudeki na Vampire

Yamamoto-kun is a male university student living a normal life. Before him appears Sono-san, a clumsy vampire. Unable to learn bloodsucking skills, she was chased out of the vampire village and comes to live with Yamamoto-kun, who can't abandon people in trouble. It's the start of a romantic comedy about a freeloading half-vampire.

(Source: Kodansha, translated)