Union Planning emerged in the gaming scene with "Kuroneko-sou Souzoku Satsujin Jiken" in 1998. This title received a warm reception for its engaging narrative and unique blend of mystery and adventure, establishing the publisher's reputation for quality storytelling. The company's dedication to immersive gameplay is evident in titles such as "Kuroneko-sou" and its sequels, which have captivated players with their intricate plots and character development.

Specializing in visual novels and adventure games, Union Planning has developed titles primarily for PC and console platforms. Their work on the "Kuroneko-sou" series showcased innovative narrative techniques and branching storylines, influencing trends in the visual novel genre and setting a standard for future titles.

The publisher has achieved significant milestones, including the successful launch of multiple sequels and expansions, as well as partnerships with various developers to enhance their game offerings. Their market reach has expanded through collaborations with international distributors, allowing their titles to gain a broader audience.

Union Planning's portfolio reflects a commitment to delivering quality gaming experiences. Their contributions have resonated with players and critics alike, earning recognition for their engaging narratives and high production values, often receiving accolades in visual novel categories at gaming awards.

Union Planning continues to shape the visual novel genre with upcoming projects, demonstrating their ongoing influence in the industry and commitment to evolving storytelling in gaming.