Nurse Witch Komugi-chan Magikarte (2002)

Ungrar, the King of Viruses, has escaped from his prison cell in Vaccine World. Maya, the Goddess of Vaccine World sends Mugimaru down to Earth to find a human to accept the powers of Vaccine World and become the Magical Nurse. He finds the best (and the only willing) person for the job when he meets Komugi Nakahara.