A seven year old movie star by the name of Kazuki Kinukawa comes to the Moore office to try and find his mother who abandoned him at the office. His reasons are to tell his mother he will not give her any money now that he is famous. Conan finds out that the kids mother is at Atami due to the old dirty postcards she sent him. Kazuki reveals that he remembered that his mother had a mole near her breast. A man who is trying to confirm the rumor that Kazuki's father is a murderer is found dead in a tub.

A picture is found on his cellphone; The culprit is a woman with a mole near her breast. Conan finds out who the murderer is. Conan also figures out the culprit was one of the woman who pretended to be his mother and was the one to spread the rumors. Conan reveals that his real mother is also here, and that she truly loved her son and the same for her son; the postcards were dirty because they were stained with tears. While signing autographs, Kazuki gives his mother a postcard and tells her to send it to him or he'll visit her again. He leaves while wearing his sunglasses and his mother cries and apologizes to her son.

Sonoko's uncle wants to capture Kaito Kid to improve his fame. Kaito Kid arrives on the scene and seemingly walks on air to investigate the treasure he will steal. Conan investigates and finds out the trick Kaito Kid used. The second time Kaito Kid tries to steal the jewel but it was revealed to be a distraction. Kaito Kid steals the jewel from indoors and is making his escape on a motorcycle when Conan is found to be on the passenger seat. Kaito Kid manages to lose Conan and escape once again.