The City 109 series uses a 3D-rendered art style that mimics high-end CGI.

This series is popular in underground gaming communities because of its high-quality artwork, complex stories, and focus on the relationship between the twin characters in an urban setting. The World of City 109

Part One is the start of the series. It provides the essential "hot" scenes and character introductions. Fans usually access these through adult gaming portals or by supporting the developers on subscription-based creative platforms.