The four goddesses alongside their sisters—Nepgear, Uni, Rom, and Ram—meet at a famous mountain resort in Lastation Kingdom seeking that nostalgic summer vacation feeling. But their plan to sit back and relax in a hot spring is interrupted when the younger sisters are swept into a portal leading to a parallel universe! The seemingly unfortunate situation takes a comical turn when they are greeted by a familiar face.

Hikaru has always believed herself to be just a normal high school girl...well, as normal as a teenager with a genius mad scientist for a father. She spends her time with her best friend, day dreaming about the boy she loves and watching her favoite super hero show. One day, the past that she has knows nothing about comes back to haunt her. She is shocked to learn that she is the last surviving member of royal line from a far away planet. Even more, she finds out that she has been protecting the ultimate armour and that it can decide the fate of the entire galaxy. (Source: ANN)

The anime follows Tsukasa, whose dream is to become the best at Gigant Shooter (battles in a game similar to pog) in the world. The menko card his father left for him called King Menger is his partner. Tsukasa's fellow gamers are the cute but tsundere Koide Miruko, the spectacled bully Numata Manabu, and the realist and sharp-tongued Doumoto Ataru. (Source: ANN)

Unaired episode 13 of Choujigen Game Neptune: The Animation, included in the 7th BD/DVD volume.