Matsuri is a regular high-school girl who has fallen in love, just like many others. However, her love life is safeguarded in a unique way – a protective charm that houses Mimori, a god of protection. Mimori assumes the appearance of a tiny boy and ensures the safety of Matsuri while providing support in her romantic endeavors. But as time passes, Mimori discovers that his fondness for Matsuri goes beyond mere responsibility. Is it possible for love to blossom between a human and a god?