The story starts from the perspective of the protagonist Naoki, who is a taciturn college dropout who works part-time in his father's scrap recycling company. One day Naoji met a boy named Maki at the swimming pool. When he went home at night, he gave Maki and his blind grandma a lift. In the car, grandma talked about her experiences traveling around the world when she was young, including visiting the Iguazu Falls in "Happy Together". However, after she became seriously ill and was hospitalized, she confessed to the boys that she had never left Japan—that she had made up all the stories. She gave her bankbook to her grandson, hoping that Maki would see the world for her, but grandma didn't know that she didn't have much money anymore. Maki, who couldn't bear to tell his grandma the truth, had no choice but to record and synthesize various sound effects to imitate his travels around the world. After making a tape, he asked Naoji to play it to his grandma. Naoki became Maki's assistant without hesitation. The two of them collected the sounds of waterfalls, seas, and forests together, sleeping in the wilderness or playing barefoot in the garage, playing wrestling games that only each other understood, and releasing their inner secret emotions. After a seemingly carefree time, Naoki made a request: Can we really travel around the world? For example, going to see Iguazu Falls?
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