Look for local stores that stock "Manhwa" (Korean comics) or "Manhua" (Chinese comics), as this title falls into those categories. Online Marketplaces: Mercado Libre:
The series follows a male protagonist who finds himself in a world where the male population has nearly disappeared due to a global event or genetic anomaly. As one of the few—or the only—men remaining, he becomes a figure of intense interest, power, and competition among the women who now lead society. Key Features comic el unico hombre entre ellas new
Since your keyword is in Spanish, let's address the best platforms to find in Latin America and Spain: Look for local stores that stock "Manhwa" (Korean