The anime follows Machi, a middle school student who serves as a shrine maiden at a Shinto shrine and takes care of a bear, who lives on mountain in Japan's northern Tohoku region. The bear, Natsu, has the ability to talk and is Machi's guardian. When Machi explains to Natsu that she will attend a school in the city, he gives Machi a set of trials that she must pass in order to be able to survive city life.

A sexually mature wife was overwhelmed by her desires. The person she chose to swap with was a lesbian friend from her high school days. She was impatient to wait for her husband, and began playing while remembering the past. Mixing in the pleasure techniques she had experienced since graduating, the lesbian play in all sorts of ways was exciting, and the two of them ascended to heaven at the same time...