Mikakunin Shounen Gedou(2004)

Mikakunin Shounen Gedou

Sarara’s normal life changes one day after she meets Gedou, a mysterious boy who claims himself a doctor of unidentified creatures. Sarara’s suspicion towards the young doctor results in Gedou revealing his true self to Sarara. Despite being shocked to see Gedou’s true self, Sarara decides to know more about Gedou and unidentified mysterious creatures.

(Source: Japanese Publisher, translated)

Included one-shot:
Volume 3: Mikakunin Shounen Gedou (Pilot)