Kakeru Noyama falls in love at first sight with Mai, a girl who gives a man a spectacular slap in the park. Her friend Miki is worried about the outspoken but inactive girl, but her expectations are defied and her romance takes a sudden turn for the better. One day, however, he sees her toasting a Coke with a guy. 'Who is that guy?' Later, he sees Mai chewing gum with a different man in a friendly manner, and when he sees her smoking a cool cigarette with another man. Miki gives the example of herself and her boyfriend Akira and urges him to pursue the truth. Finally, Kakeru takes action... The elation that love has started. The fear that their relationship might end if she hears this. The film rhythmically conveys these feelings with rapid-fire dialogue and boldly cut images. The character of the protagonist, who is timid, hot-blooded and gentle, honestly embodies the confusion of people in love.

Airi works at a small record shop in the town of Shimokitazawa. One day, while at a nearby thrift store, Airi encounters a shoplifting incident. The shoplifter apprehended by the detective explains that they stole the T-shirt to sell it and make money to buy a rare record. The elusive record the shoplifter was searching for is a mythical record called a “Ghost Record,” a nonexistent record conjured by the desires of record collectors. After hearing the title was called “One Day In SHIMOKITAZAWA,” Airi becomes interested in the record and eventually falls victim to a scam on a website selling “One Day In SHIMOKITAZAWA.” Seeing Airi distressed by the scam, the people of Shimokitazawa come up with an idea...