Tập 720: Chuyến tham quan bí ẩn lửa và nước tại Aso liên quan đến việc trao đổi đồ chơi bị đánh cắp

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Conan, Ran, The Detective Boys, Haibara and Kogoro go on a trip to Mt. Aso. They meet a boy called Justin and his mother there. Justin shows them his stamp collection book, where he has stamps from all the tourist attractions at Mt Aso. They later part. While they are on a break, we see a man leaving behind a bag on a bench, and another man picks it up and leaves behind a stuff toy. Ayumi tries to return the toy but is pushed away by the man. He is chased by the police and Conan. They see the man dashes into Justin, who is carrying a similar toy and the toys get exchanged. Everyone returns and we find that the man who left the bag is Monkichi Kumada, who owns Kumamon Foods. He says a thief stole important details regarding new sweet tastes which are un-patented and demanded 10 million. Another detective calls, Kouda, and informs them that the thief is caught but there was nothing in the stuffed toy. Conan explains that the toys got exchanged and tracks down Justin's location. As they are nearing Justin, they see the thief trying to snatch the toy from Justin's mother, and while trying to protect her, Justin is kidnapped by the thief. He threatens the police with Justin's life to not to follow him. Conan wonders how the thief got Justin's location so fast, when the only people, other than the original gang, present were the detectives, the president and another worker, Inoue. (Source: Wikipedia)