Ukagaka is a Japanese software series featuring desktop mascots, also known as 'ghosts,' that interact with users via speech bubbles. Originally developed as a novelty desktop companion, Ukagaka expanded into a subculture with user-created characters and scripts, often used for entertainment, chatting, or information display. The series is known for its customizability and community-driven content. While not an anime, it is widely recognized in Japanese digital culture.