This is Gameindustri. Beings called Goddesses rule the countries of this unreal world. The four goddesses govern four states: Planeptune, Lastation, Lowee and Leanbox. For many long years these countries fought each other over the Share, the source of the Goddesses' power. However, fearful that the conflict would pointlessly erode their strength, the goddesses signed a Friendship Treaty forbidding them from taking the Share by force. Under the treaty, the Goddesses and their younger sisters took a step forward to a new stage in their relations. It is the dawn of a new, dynamic era marked occasionally by shared laughter, disputes as well as cooperation. But what does the future hold in store for Gameindustri...?

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

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

The Goddesses and their sisters take a camping trip to "My Summer Vacation Mountain." When the sisters uncover another dimension at the shrine gates, they meet an older version of Neptune. Will they find their way back home, and, more importantly, are two Neps better than one?

Four friends decide to spend a winter weekend in a rented house in a Uruguayan beach town called Neptunia. Once there, the friends begin to realize that the people are acting strange.

Four friends decide to spend a winter weekend in a rented house in a Uruguayan beach town called Neptunia. Once there, the friends begin to realize that the people are acting strange.

The story of the mecha anime revolves around 13-year-old Meguru Tokio, who is suddenly approached by a strange woman who is running away from something. She finds out that the girl's name is also Meguru, and although she appears to be around 17 or 18 years old, she has a passionate personality, which the younger Meguru has trouble dealing with. Meguru Tokio gets drawn into the older Meguru's fight with a mysterious organization, and gets targeted by the organization as well. The one targeting them from the organization was the narcissist, Rei. Although the younger Meguru can't believe that the older one came from the future, she fights alongside her in a dimensional robot. After fighting with Rei, she finds out that even though the other Meguru is older than her, she is Meguru Tokio's descendant. After finding out that someone has jumped into the past by the older Meguru's history surveillance device, the two also make a leap back into the past.