Shikada Kokonotsu's father owns a rural sweets shop, and his plan is for Kokonotsu to take it over one day. However, Kokonotsu wants to be a manga author instead! One day in summer, the cute but weird girl Shidare Hotaru, from the famous sweets company, comes to pay a visit. Apparently, Kokonotsu's father is famous and she wants him to join her family's company. However, he will only agree if she can convince Kokonotsu to take over the family business!

Although greatly abbreviated and simplified, and in a back-and-forth sequence, almost all of the dialogue and narration is based on words extracted from the original story. The setting of the original film (1957), in which long-distance calls are connected to a switchboard so that the recipient knows where the call is coming from, has been eliminated, and the public telephones are digital telephones installed after 1996. Other alterations include the following.