Richard deduced from the victim's dying message JUN that it points to Mina Kurokawa, as June is also the dry month (Minazuki) and that she was born in June which earn a scold from Mina herself. Conan then puts Richard to sleep and starts the deduction. While sorting mail at Professor Agasa's house, Conan finds a strange letter (an invitation to a tea party) which is addressed to Jimmy Kudo. The letter was sent from a man named Teiji Moriya who is a famous architect. Conan calls Rachel Moore using his Voice-Changing Bowtie to mimic Jimmy's voice and tells her he can't go to this tea party and if she would go in his place. He tells her to bring her dad, Richard Moore and "that kid".
Rachel says she will do it only if he goes to a movie with her on Saturday; Conan tries to make her change the date but she is determined that it has to be on May 3rd. She then asks him whats his favorite color: Red or Blue to which he responds Red. Conan leaves the pay phone and while walking home trying to figure why she wants it to be on May 3rd. While on the way home he meets Inspector Megure who introduces him to Ninzaburo Shiratori.
While eating dinner with Rachel and Richard, Rachel tells Conan she's taking Jimmy to the movies on May 3rd and when it hits midnight she will give her gift to him (which is a red polo shirt). Conan then realizes that May the 4th is his birthday.
Conan tricks Richard into going to the tea party as Richard doesn't want to go in the first place. They meet Teiji Moriya and tell him that Jimmy couldn't make it but that Richard is another famous detective. Moriya gives everyone a quiz and asks them to solve it. Conan is the first to solve it so he gets to go to see his gallery with Rachel. While observing the pictures Rachel tells Moriya that shes going to the movies with Jimmy and is going to be watching it in one of the buildings he designed.
The next day Rachel goes out to get some food and Conan goes to Agasa's house. Trying to think of what to do for his movie "date" with Rachel. A news station on T.V. reported that someone stole lots of octogen which is the main component for plastic explosives. Right after, Professor Agasa receives a phone call asking to talk to Jimmy, the man using a voice changing device tells Jimmy that he is the one who stole the Octogen and tells him to give his mobile phone number to him. Conan tells him his number and the man tells him to go to Greenbelt park or else the kids will die.
Conan uses his skateboard and rushes to Greenbelt park where he finds: George Kaminski, Amy Yeager, and Mitch Tennison playing with a remote controlled plane. Mitch tells Conan a man with a mustache and a beard gave it to them. Conan notices that there is a bomb on the plane so he takes the controller away from Mitch but he refuses to give it to him since its George's turn. Conan tells them there is a bomb on it and they drop it and the antenna breaks. The plane is now flying uncontrolled so Conan uses his Power-Enhancing Kick Shoes and kicks the Controller into the Plane blowing it up. Conan then realizes this isn't a prank and then gets another call telling him about another bomb.
When Conan was searching for the second bomb, he only manages to bring to a deserted place before it blows up which sends Conan flying into a tree. He wakes up in the hospital. They get another notice that there are more bombs planted on a train track. They also found that one case related to Jimmy might connect to this mass-bombing event.
