At the end of the last summer vacation of high school, Youta Narukami spends his days preparing for the university entrance exams, when a young girl named Hina suddenly appears, proclaiming herself as the "god of omniscience." Youta is confused and does not believe Hina when she tells him "The world will end in 30 days." After witnessing Hina’s God-like predictive ability, Youta begins to believe her powers are real. Hina, who is innocent and childlike despite her supernatural powers, decides for some reason to stay at Youta’s home. Thus begins the start of their lively summer before the end of the world.
Episode 1
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.
Episode 2
Yota brings Hina to his house. Hina hatches a variety of schemes to help Yota get closer to Izanami. Yota helps his sister with a summer assignment.
Episode 3
Sora wakes up and tells her family about her friend's failing ramen restaurant. Hina hatches a plan to save it. Meanwhile, a mysterious boy returns to Japan.
Episode 4
Hina finds out about Yota's celebrity crush. If Yota can execute Hina's latest scheme, he may have a once-in-a-lifetime experience.
Episode 5
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.
Episode 6
Yota wants to study, but Hina is dying to go to the summer festival. Yota calls together the members of their motley crew to make summer memories.
Episode 7
Sora needs Yota and Hina's help to shoot a movie. Hiroto's investigations of Dr. Korogi may finally bear fruit.
Episode 8
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.
Episode 9
Hiroto's investigation finally leads him to uncover Dr. Korogi's secret. What will this mean for Hina and Yota?
Episode 10
The end of the world has come and gone. Yota's efforts to find Hina turn up nothing. However, a lead is sitting under Yota's nose. Will he realize before it is too late?
Episode 11
Yota has finally found Hina, but she recoils at his touch. Yota's false identity will only last 2 weeks. Can he turn the situation around before then?
Episode 12
Yota's time at Yamada Sanatorium is coming to an end. Will he have to say goodbye to Hina forever?
