Omamori No Kamisama

From Turtle Paradise:
Meet Matsuri, a high-school girl in love. Typical, right? But no one knows what’s in Matsuri’s special protective charm… Mimori, a god of protection! Mimori takes the form of a miniature boy and protects Matsuri from danger while supporting in her quest for romance… Until he realizes that he, too, has feelings for her! Can true love exist between a god and a human?