Choujigen Game Neptune The Animation: Nep no Natsuyasumi  

초차원게임 넵튠 THE ANIMATION: 네튭의 여름방학, 超次元ゲイム ネプテューヌ THE ANIMATION ~ねぷのなつやすみ~, 超次元游戏 海王星～涅普的暑假～, Choujigen Game Neptune The Animation OVA, Hyperdimension Neptunia OVA, Choujigen Game Neptune THE ANIMATION: Nepu no Natsuyasumi, Hyperdimension Neptunia: Nep's Summer Vacation

Four goddesses along with their siblings Nepgear, Uni, Rom, and Ram gather at a renowned mountain resort in Lastation Kingdom for a "summer vacation" vibe. However, their tranquil getaway is disrupted when younger sisters are pulled into a portal leading to another universe. Despite this unfortunate turn of events, it becomes amusing when they encounter a familiar figure upon arrival in this new realm.