I used to see the Rockabilly dancers all around Yayogi Park in Shibuya (1). These guys would hang out in the park on the weekend with pompadours and jean/leather jackets and do goofy dances. It was sick. Something about Japanese culture encourages dedication to your hobbies, and people get super involved in them.
1) https://www.tokyoweekender.com/art_and_culture/tokyo-rockabi...