After having identified the victim they use his phone to track down three people who are at the same aquarium. His date, his ex-girlfriend and the ex-girlfriend's new boyfriend. All of them provides a phone video as an alibi. The date explains the victim might have been in some shady troubles, the ex-girlfriend says that the victim has kept bugging her with phonecalls and the new boyfriend tells that he was been bugged with strange e-mails, that he has deleted without reading, and is choked to learn that they are from his girlfriend's ex-boyfriend.
The culprit is Naho Ojiro. Kunihiro was blackmailing her by getting her to pay him since he's neck is in debt or he would send embarrassing photos of her while they were dating to her lover, family and work place to humiliate her.
The Detective Boys are preparing for a kite flying competition. On the ride to the venue, the others take notice of Haibara, who seems to be in a good mood, listening and humming to a song through her earpiece. Conan tries to figure out what she might be listening to from Agasa, who only mentions about her recent obsession with a recent special on Higo and before he could spill anything else, Haibara stops him. Conan comes up with a plan, that is letting the recording function in the phone turned on and turning the display black, he gives it to Ayumi to slide it secretly in Haibara's pockets when she starts humming the song.
The rest of them manage to get the kite flying, but soon, the tail rips off and it ends up circling and crashes down. Right beside them, a man named Renno Ryouta, is preparing to fly his kite while talking with his wife, Renno Takami, on the phone. She seems to be mad at him, for having cheated on her. As Ryouta tries to denies her claims, a man standing beside him, Kakura Yuitoshi, mutters that the woman Ryouta cheated on, was his younger sister. She is lying in the hospital, having self-harmed herself due to relationship between Ryouta. Yuitoshi even claims that Ryouta's kite flying partner, Yatsukoshi Takeshi, also had a crush on his sister, and warns Ryouta about it.
Meanwhile, Ayumi spills out the Conan's plans to Haibara. She soon realises having lost the cellphone somewhere. They try to look up in front of toilet box, where Ayumi felt something felt down while taking down her handkerchief back then. But to no avail. They guess that the one who stumbled behind Ayumi after she came out of the box, must have picked it up. Meanwhile, Conan and others are dumbfounded looking at their broken kite, which is beyond repair. Just then, they hear shouts of Takeshi warning his partner, Ryouta, who was walking backwards with the kite in hand, about the cliff's edge. But by the time he realises, it's too late, and Ryouta falls off the edge into the Teimuzu river. Conan takes notice of the cellphone lying near the edge, whose call is still ongoing, and thinks this might not be an accident.
The culprit is Fumiyuki Kandachi. Kandachi misunderstood Natsuko's checking system, in Japan (✓) is marked for wrong while (O) for correct; since she studied in America it was reversed. Because she used this system, Kandachi was confused about the difference and struck her without thinking. Since this was an assault and not a homicide, Inspector Megure would show leniency, while another teacher runs in and says the hospital called to say Natsuko has taken a turn for the worse. Conan, Camel, and Jodie rush to the hospital and she just got out of a successful surgery. Amuro tries to antagonize Camel into saying something about Rikumichi Kasuda, but Jodie pulls him away trying to keep him safe. Only Camel lets slip how Rikumichi died after she asks, and she vanishes leaving Camel in a confused state. The Jodie he talked with was really Vermouth and she tells Bourbon what she just learned.
