In the postwar era, enka was canonized as the “soul of Japan,” a cultural vessel projecting a unified national identity (Yano 2003). Yet this quintessential “Japaneseness” was itself a postwar construction that effaced broader Asian entanglements (Bourdaghs 2012; Shamoon 2014). This process aligned with what Dower (2009) terms “imperial democracy”—a project that sought to forge a democratic future by disavowing an imperial past. In this shift, former colonial subjects—most notably Zainichi (ethnic Koreans remaining in Japan)—were rendered socially and historically invisible.

I argue, however, that this "national purification" of enka exposed the inherent fragility of its claim to a homogeneous Japanese essence. A primary symptom of this fragility was the persistent circulation of rumors suggesting that certain iconic enka singers were "secretly Korean" (Wajima 2018). These rumors functioned as a form of sonic surveillance, where public discourse scrutinized vocal styles, birthplaces, and biographies to patrol the borders of Japaneseness.

The paradox, then, runs deep: if the Zainichi presence was meant to be relegated to the nation's margins, why did the "soul of Japan" become the very site where that presence repeatedly surfaced in the public imagination? Drawing on Gordon’s (2008) concept of haunting, I suggest that these recurring suspicions reveal the impossibility of severing a national sound from its imperial history. The voices mobilized to chant postwar unity were inextricably linked to the colonial circuits of labor that produced them, revealing enka not as a purified essence, but as a genre fundamentally structured by its imperial traces.