Choujigen Game Neptune: Nep no Natsuyasumi Hyperdimension Neptunia The Animation: Neptune's Summer Vacation
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?
[Source: Idea Factory Intl]