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When Jin Mikuriya uses the trunk of a sacred tree to carve a statue for a school project, he accidentally summons a guardian deity named Nagi.

When Jin gets a surprise visit from his classmate and friend Tsugumi Aoba, Nagi fabricates a story explaining her living with Jin. Later, Nagi flees the house after an argument with Jin and finds herself in danger when trying to cleanse a impurity on her own.

When Nagi secretly infiltrates Jin's school to search for an impurity, she stumbles upon a mysterious girl.

Nagi is thinking of being an idol in order to gain followers since her powers are going to be reduced by the tree being cut down. Jin encounters a famous idol who turns out to be Nagi's goddess sister.

Zange tries to seduce Jin and challenges Tsugumi and Nagi to a cooking contest. Meanwhile, Nagi is becoming so popular with the students at school, the teachers find out she is not actually enrolled.

When Nagi decides to get a parttime job at a maid café where Tsugumi is also working by request of a friend, she is surprised by Jin and his fellow clubmates from the art club.

When Nagi shuts herself into Jin's closet and refuses to come out, Jin calls Meguru for help.

During a stormy night, Daitetsu stays over at Jin's house, where he wonders about Jin and Nagi's feelings for each other.

When rumors about the Daitetsu and Jin being a homosexual couple start to spread, Zange decides that the best solution to the problem is for Jin to officially date a girl.

When the Art Club, Nagi and Zange are having a karaoke party, Tsugumi, Jin, and Zange's relationship complications quickly make the session extremely awkward.

Jin demands that Nagi tells him more about herself, her reasons for staying in Jin's home and the occurrence of impurities in the village. After she refuses and runs away, Jin discusses the matter with Reiri Suzushiro.

When Jin arrives at home and he finds that Nagi is nowhere to be found, he keeps looking for her without success.

Tsugumi persuades Jin to search for Nagi again with the help of the school's blog.