Hyperdimension Neptunia Re;Birth1 (超次次元ゲイム ネプテューヌRe;Birth1, Chou Ji Jigen Game Neptune Re;Birth1) is a remake of the first installment to the Hyperdimension Neptunia series, Hyperdimension Neptunia. The story again follows Neptune, who has fallen to the world beneath Celestia after a battle between her and the other three CPUs. While the core of the story is still the same, Hyperdimension Neptunia Re;Birth1 has an entirely new plot and uses an overhauled version of the gameplay system from Hyperdimension Neptunia Victory, with additional new features.