The phrase references a genre of Japanese adult video games (eroge) characterized by intense, dedicated development (kaihatsu zanmai) and the absence of censorship (uncensored). These games typically feature explicit sexual content (h mo) alongside interactive gameplay.
The significance of this area within the adult entertainment industry stems from its unique blend of programming, artistic design, and narrative creation tailored to a specific audience. Its history reflects evolving societal attitudes toward sexuality and technological advancements in game development, contributing to a niche market with dedicated consumers and creators.