Yukito Kunisaki arrives to the town in hopes of making money for food with his puppet show. He meets Misuzu Kamio, a strange girl living in the town. Misuzu manages to lure Yukito to her house with food at which after a discussion she offers him residence. Soon after Haruko Kamio, Misuzu's foster mother, arrives to the house. Haruko initially opposes Yukito's stay but later decides to allow him to stay in the shed.

After Minagi's mother's mental condition has caused her to forget she has a daughter, Minagi leaves home and joins Yukito. Yukito tells Minagi he's leaving town and wants her to come with him, but instead leads her back home to face her mother. Michiru is invited to eat at Minagi's house. Michiru leaves, having fulfilled her purpose.

Kanna's mother claims to be "tainted". They all escape from the mountain but their pursuers manage to kill Kanna's mother. Before she dies, she passes the ancient prayer to Kanna. While the pursuers are closing in, the 3 talk about settling down near the ocean, but Kanna knows this is only a dream. She takes flight but the monks curse her and she gets killed by the soldiers. Ryūya and Uraha learn about the curse and Kanna's suffering and vow to end it by having a child who will break the curse.

The summer festival has finally arrived, but unfortunately it rains that day and thus the festival is canceled. Wanting to do anything she can for Misuzu, Haruko brings her to the local shrine. As mother and daughter bond, can Haruko ultimately save Misuzu from returning to her other self in the vast blue sky?

The events of the Summer arc are retold from the escape from the shrine to before the mountain. These events also include scenes not shown in the original Summer arc.

The relationship between Ryūya and Kanna is explored more showing their bond to be more romantic than platonic in nature.