Neptune (ネプテューヌ Nepuchūnu) is the human form of Purple Heart, the CPU of Planeptune, and also the main protagonist in Hyperdimension Neptunia who loses her memory after a terrible fight and is banished to Gamindustri. After crash landing, Neptune finds herself in the home of the nurse in training, Compa. Now she must try to rally the other Goddesses and fellow party members to come aid her in defeating the evil goddess, Arfoire.
Neptune is the older sister of Nepgear. In Mk2, she is captured along with Blanc, Vert, and Noire, so their sisters must step up and rescue them.
Her dungeon ability, "Hammer Crush" allows Neptune to break any obstacle in her path in order to continue exploring or come by special items. Her default weapon of choice is a sword.