A strange girl dressed like a nun appears before Yota Narukami and declares she is an omniscient god. As he attempts to return her to her house, she endeavors to prove her power to him.

While studying with Izanami at the library, Yota learns of trouble in the Izanami family. He and Hina want to help, but the issue is so great it looks like magic will be required to solve it.

Yota becomes motivated to learn more about where Hina came from. Finding out more entails traveling to a beach far from his home town. Since Hina has never seen the ocean, the two take the trip together.

Yota's time at Yamada Sanatorium is coming to an end. Will he have to say goodbye to Hina forever?