Assertion: punk's subgenre | /r/MadeOf | steampunk-themed manga
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text: The first known appearance of the term steampunk was in 1987, though it now retroactively refers to many works of fiction created as far back as the 1950s or earlier A popular subgenre is Japanese steampunk, consisting of steampunk-themed manga and anime, with steampunk elements having appeared in mainstream manga since the 1940s.