Along with vinyl's recent resurgence, another throwback from the 1970s is gaining popularity in the digital age: the boombox portable music player.

While radio-cassette players are viewed with nostalgia among older generations, they represent something new and fresh for young people, even if the machines themselves are considered dinosaurs.

At a "big radio-cassette player" exhibition held at Seibu Shibuya department store in Tokyo in August, 24-year-old Takuya Gomi's eyes sparkle with excitement as he checks out the clunky, unsophisticated music players lining the shelves.