The famous architect Teiji Moriya invited Shinichi to attend a tea party held at his house, and Conan had to call Xiaolan for help. Conan, Xiaolan and Maori Kogoro were attracted by the absolutely symmetrical magnificent architecture before entering the Moriya house. At the tea party, Moriya Teiji surprisingly attacked the young designer loudly, saying that the aesthetic principles of architecture would be completely destroyed by them. Conan solved the problem he gave to the guests within the specified time and was allowed to visit the exhibition hall with Xiaolan where his design drawings were displayed. During the conversation, he lamented that the works he created when he first became famous in his 30s were not symmetrical enough to be called perfect, and he found out from Xiaolan that she was going to meet Shinichi in the Beika Building to celebrate Shinichi's birthday. Soon, Conan received a number of calls challenging Shinichi, and the other party told him that he had placed a bomb that would explode at a certain time in a certain place. After Conan resolved the crises one by one, he began to analyze with the police and Maori who was responsible. When the TV reported the most sensational bombing, Conan was shocked to think that all the bombs were placed near the works of Teiji Moriya, who he considered imperfect. When everyone visited Teiji Moriya, Conan secretly checked his house and found evidence that he was the murderer. It turned out that he was a fanatical perfectionist who wanted to destroy the imperfect symmetrical works he designed when he was young due to compromise, and take the opportunity to take revenge on Shinichi who did not realize his grand design dream in Nishitama City. At the moment of being caught, Teiji Moriya's sneer made Conan realize that the Beika Building was also his imperfect work, and Xiaolan was waiting for Shinichi there.