The Neptunia series started out with Sega crossovers. Alex Kidd, Space Harrier, and Fantasy Zone appeared in Hyperdimension Neptunia for PlayStation 3 in the disc system. Compile Heart and Sega are working together on another crossover that brings the console goddess from the Neptunia series and the Sega Hardware girls together.
Dengeki announced Hyperdimension Great War Neptune Vs. Sega Hardware Girls – Dream Union Special (temporary title) for PlayStation Vita. More details about the game will be revealed later this week.
Who are the Sega Hardware Girls? They are official Sega consoles like the Mega Drive, Sega Saturn, and Dreamcast anthropomorphized as moe style characters.