The culprit is Heihachi Mikami. Ryoji Amatsuchi reveals he prevented everyone from leaving his inn in order to know who had murdered his friend Asao Kono. He eventually plugs the inn's phone cable again in order to call an ambulance, since Ai is "suffering from a violent stomach ache".
The police arrive later on, and Conan hears the sound of Yamamura's dialling a number on his phone's keypad, whose music reminds him strongly of Vermouth's message to the boss of the Organization. Yamamura tells Conan he's phoning his grandmother in Tottori.
Conan reveals the culprit to be Kyosuke Haga. As Kyosuke is taken away, he is a composer who has the perfect pitch so Conan asks him the tune of a song from the cellphone numbers and finds out the Boss of the Black Organization's number is the song "Nanatsu no Ko".
People
Benio Tsumagari
54 years old
Shitara family butler
Hasuki Shitara
23 years old
Choichiro's granddaughter
Genzaburo Shitara
Victim (burned)
60 years old
Shitara family's third son
Kyosuke Haga
32 years old
Composer with perfect pitch
Choichiro's nephew
Ayane Shitara
Victim (fell)
68 years old
Choichiro's wife
Choichiro Shitara
72 years old
Head of the Shitara family
Danjiro Shitara
Deceased (beaten)
Kyosuke's father
Shitara family's second son
Chinami Shitara
Deceased (illness)
Danjiro's wife
Kyosuke's mother
Emi Shitara
Deceased (fell)
Genzaburo's wife
Furuto Shitara
Deceased (fell)
Hasuki's father
Major events
Conan learns the phone number for the Boss of the Black Organization.
