Hyperdimension Neptunia U: Action Unleashed is a hack and slash video game and a spin-off title in the Hyperdimension Neptunia game series. The player can choose two characters to play with and switch between them during combat. The characters can transform and if they take too much damage, their clothing gets damaged.

In the whimsical world of Gamindustri, a realm shaped around the video game industry, peace is watched over by four divine goddesses known as the CPUs, Neptune, Noire, Blanc, and Vert, together with their younger sisters, the CPU candidates. Set during a rare stretch of calm following the endless Console War of earlier adventures, the goddesses find themselves searching for new purpose, eager to raise their profile and win fresh support from the people and nations of Gamindustri. Their opportunity arrives in the form of two rival journalists, the enthusiastic Dengekiko and the sharp-tongued Famitsu, who offer to chronicle the heroines' exploits as they take on guild missions. Issued transforming combat armor by their employers, the two reporters soon join the fray themselves, fighting alongside the goddesses and their sisters as this colorful band battles monsters and chases glory across the land.