Kaori Masukodera, left, and Mai Chusonji of the duo Bed In, whose garish outfits and bubbly music are part of a nostalgic reappreciation of Japan’s 1980s economic boom.Credit...Ko Sasaki for The New York Times TOKYO — Kaori Masukodera remembers, barely, riding as a child with her mother, her hair teased and her lips bright red, in the family’s convertible to the beach. It was the last gasp of the