Ran, Sonoko, and Conan are on the bus ride to Haido Hotel. Sonoko felt like that someone touched her butt. She caught the guy in the blue hat and accuses him that he's the pervert. The guy in the blue hat tells Sonoko that he's not a pervert but Sonoko thinks he's lying. So she told Ran to beat him up. Ran does as she says so she kicks but the guy in the blue hat blocks Ran's kick with his leg. He punches and Ran dodges. He kicks and Ran dodges again. Ran realizes that her opponent is using Jeet Kune Do. The guy in the blue hat is trying to explain that he's not a pervert but Conan explain for him instead. Conan saw that the real pervert was about to touch Sonoko's butt and the guy in the blue hat stopped the pervert. Sonoko got really mad at the real pervert. When the bus stops, the pervert got out quickly and runs away. Ran apologizes to the guy in the blue hat and he says it's okay. He asks where Ran is going and she told him that she and her friends are going to the Haido Hotel. The guy in the blue hat is going there too. He also thank Conan for explaining his innocence that he's not a pervert. When they arrived at the hotel, the guy in the blue hat is making a reservation but it seems he's having problems. Conan wants to eat cake so Ran, Sonoko, and Conan are going to look for a place to eat cake at the second floor of the hotel. When they're about to take the elevator, the woman named Toshiko Hirukawa came out of the elevator. She asks Conan where he's going and Conan told Hirukawa that he's going to cake buffet at the second floor. Hirukawa told Conan that he can't use the elevator because she says it goes to the annex. Conan thought the annex was under the renovation. Ran apologizes to Hirukawa and she says it's okay. She suggest that they should help each other when in need. Hirukawa's friends found Hirukawa and she apologizes them for keeping them waiting. While Ran, Sonoko, and Conan left, the man mentions how the person is doing. Hirukawa explain that the person was drunk and keeps shouting curses as usual. She says that after she scolded the person severely, the person started crying. Hirukawa also says the person wants to apologize to everyone and admits his sins, so the person like them to go up to his room. After that, Hirukawa suggest for her friends to take a car ride and buy a recording device to record the person's repentance. Ran, Sonoko, and Conan are at the entrance to the cake buffet in the first floor. The stairs full of people. Suddenly, they heard a big bang sound from the parking lot. Hirukawa and her friends found something terrible and screamed. Conan went to the parking lot to check what's going on. The man is found dead.

After investigating the room, Sera declares the culprit.

Isao Sawaguri came to the Mouri Detective Agency and brought together three female novelists he believe are responsible for his younger sister Miku's death the previous month. Isao threatens to blow up the Agency unless Kogoro reveals to him the truth about his sister's death and reveals her murderer

Sawaguri, pleased to have another detective to find the culprit, obeys his requests to take pictures of the hostage's books which were autographed by Miku. During the course of the investigation, the authorities lose the chance to snipe Sawaguri after Ran closes the curtain as she believes Shinichi can find a solution to prevent any deaths. Miku's blog post reveals her last three visitors were from an elephant, a fox, and a rat. Conan explains the animals were based on the hostage's professions: The elephant is Sumika Nihei, due to her husband's seal designs is similar to an elephant's tusk; Shinobu Yuchi is the fox since she is a bakery and her food is colored like a fox's coat; and the rat is Tamami Mitsui whom is a stonemasonry which is gray like a rat's coat. In response, Sawaguri prepares to kill Mitsui.

Conan declares Mitsui is innocent since she was witnessed leaving Miku's room; Sawaguri inferred the culprit crossed over from the balcony and left by his room. As for Miku's death, Conan explains she was mimicking the suicide of the main character in her book. Sawaguri becomes distraught as a result and is taken in by the authorities.

Heiji and Kazuha visit Tokyo where the two part ways. A murder occurs at the restaurant Kazuha is in, forcing Kogoro, Ran, Sera, Heiji, and Conan to investigate.

Heiji reads a letter he received from an already dead man and old acquaintance of his mother, design company president Kouhei Wakamatsu, who was killed a month earlier in his Karuizawa villa.

The police arrive and their investigations reveal the baumkuchen was cut evenly into eight pieces and that only one of the piece was poisoned.

Conan and Heiji resume their investigation while Ran and Kazuha gossip about Shinichi's confession towards Ran.

Conan and Heiji's investigation leads them to realize how Ikuro and Serika were murdered.

Professor Agasa has recently posted a video on a popular website, asking for someone to evaluate an old vase he found in his attic.

Conan realizes the kidnappers invaded Agasa's home too quickly and deduces they have visited recently; Agasa reveals three pairs of customers have expressed interest in the vase.

Conan, Ran, and Sonoko are invited to the opening ceremony of a chocolate shop that is supported by the Suzuki Group. They meet a woman named Mayuko Sakura, the shop producer. Next they meet a man named Yukihiko Tsujimoto, the chocolatier and he's Mayuko's fiancé. During Tsujimoto's show, the fire breaks out in the shop, killing Tsujimoto. Was this a terrible accident or a planned murder?

The Detective Boys discover officer Chiba's has been vandalized with a threatening word. Realizing is the culprit is the same person who has been on a vandalism spree that month, the Detective Boys push Chiba into investigating it with his first love

Chiba is unable to recall Naeko's face though notes his familiarity. During the investigation, Conan realizes the culprit's motif and has the police let the suspects leave.

When Ran, Sonoko, Sera, and Conan are walking, they receive a phone call from Ran's father Kogoro, who asks her not to bother cooking dinner for him as he will be gone for the night.

Conan completes his investigation and realizes who the murderer is.

The Detective Boys wish to capture a few beetles to bring to school, and as a result, visit Agasa's old friend in the mountains. The Detective Boys manage to find a bunch of beetles at night, but return to find Namatame injured. Namatame's last words are "Miyama Stag Beetle" before losing consciousness.

At night, Hiroshi Yagisawa and his dog, Coeur are taking a walk in Beika Street. Coeur sense something strange so Coeur is showing Yagisawa that she found the dead body in underground passageway.

The guard named Zenkichi Ooka is threatening two people to keep giving money to him. At night, Conan, Ran, and Kogoro came from the store after they had delicious spring rolls.

Mio was attacked by Karashima but attacks back in self-defense.

At Ristorante Sundayrino, Raita Banba and Hatsune Kamon are getting married. Kogoro, Ran, and Conan are also there. Everybody is having a great time with them. Later, Kogoro, Ran, and Conan are introducing themeselves to Kamon at the table. Ran heard that it was love at first sight for Banba and Kamon. As the night progresses, Banba receives a 'Goodbye' text message from Kamon. Outside, suddenly, Kamon's car exploded, right before Conan's eyes.

A second DNA test with sterile samples reconfirms the rough DNA match leading Conan to a conclusion. Conan tranquilizes Kogoro and reveals Banba and Kamon are opposite sex identical twins. The secret phone calls were to a medical consultant with the final phone call confirming the genetic match. Learning of his, Kamon clasped her face into her hands, scratching some skin off, and committed suicide. In the aftermath, Amuro pays Kogoro to have him as his apprentice

The Detective Boys meet Nanami Kyoudou, who's grandfather, Seitarou Kyoudou is the one who built "The Black Tower", rumored to have no entrance and treasure hidden within. Later, they visit her house

The mystery of Darkness Tower is revealed by Conan

Kogoro prepares to meet with the client Kei Katshitsuka. While waiting, he receives mail of Katshitsuka who changes their meeting location to a local restaurant. There, Kogoro realizes the cell phone address is different from the first message he received from the client.

Arriving at Katshitsuka's home, Ran receives a phone call from Masumi. The phone call receives noise which Tooru deduces to indicate the house is bugged.

Conan stops feigning his sleep and tells his kidnapper who is really she !!

After visiting the three, Conan explains the robber in the video was left-handed and only Takayo Tegawa fit that description.

The Detective Boys are invited to the Konno residents for a barbecue as a thanks for solving a case for them earlier. When the couple argue, the children grow concerned. Later, the husband cannot find his cell phone so his wife goes with him inside to look

The wife, Sumika, tried to scare the husband to cure his hiccups

Conan, Ran, and Kogoro went to Ohama Coast from Beika Street for two hours and they are going to have fun surfing at the beach.

Conan, Ran, and Kogoro must've slip through time (not literally). Ran won a prize at a shopping district lottery, they go to Nagasaki.

In the hospital, Sakota is lying on the bed to get his treatment done. There's a high possibility that Sakota was struck with bare hands. The Nagasaki police took in the karate girl with a black belt, Ran, who was the main suspect to the station for questioning

At the greenhouse, the wealthy property owner named Zenzou Sunada is showing Conan, Ran, and Sonoko the golden barrel cactus and it blooms flowers after 50 years