My Sweet Dragon

My Sweet Dragon (マイスウィートドラゴン) is a manga series by Yuuka Sakaki. It is serialized in The Margaret.

Plot
Chihaya, a 3rd year junior high student, is the only daughter of the priest who tends the small shrine dedicated to the Ryujin. One day, while cleaning the shrine, she finds a sleeping boy who is actually the transformed Ryujin. Fantastic love begins.