Nagato Yuki-chan no Shoushitsu: Owarenai Natsuyasumi
English title: The Disappearance of Nagato Yuki-chan: I Cannot Let Summer Break End
Japanese title: 長門有希ちゃんの消失 第17話「終われない夏休み」
Type: OVA
Episodes: 1
Source: Manga
Genres: Comedy
Studios: Satelight
Duration: 24 min
Rating: PG-13 - Teens 13 or older

Extra episode of Nagato Yuki-chan no Shoushitsu bundled with the limited edition of the 9th manga volume.