Neptune and her friends visit "Watashi no Natsuyasumi Yama" (My Summer Vacation Mountain) filled with nature to enjoy their summer vacation. The four goddesses, who gather after a long time, are having a good time as usual. During the vacation, Nepgear and other sisters go to the mountains to wander around. After going through the stretch of a long torii (Shinto shrine archway), the sisters wander off into a different dimension. Then Nepgear meets a woman who just looks like her sister Neptune in her adult form.
- Other Title: Choujigen Game Neptune The Animation OVA, Choujigen Game Neptune The Animation: Nep no Natsuyasumi, Choujigen Game Neptune The Animation: Nep Nep Darake no Festival, 超次元ゲイム ネプテューヌ THE ANIMATION
- Status: Completed
- Sub/Dub: Anime Sub
- Anime Type: OVA
- Genres: Action, Comedy, Fantasy, Sci-Fi, Animation, Science Fiction
- Characters: Blanc, Nepgear, Neptune, Noire, Ram, Rom, Uni, Vert
- Score: 7.14
- Rank: 3383
- Popularity: 5525