Superdimension Neptune VS Sega Hard Girls (超次元大戦 ネプテューヌVSセガハードガールズ 夢の合体スペシャル, Cho Jigen Taisen Neptune VS Sega Hard Girls: Yume no Gattai Special, lit. Super Dimension War Neptunia VS Sega Hard Girls: Dream Combination Special) is a crossover game between the Hyperdimension Neptunia and Sega Hard Girls franchises developed by Felistella for the Playstation Vita. IF and new character Hatsumi Sega are the co-protagonists of this game.