Welcome Home (Friends)
The Neo UN fleet, taking control of the Alvis base, is faced with a new Festum that begins to assault the island. It is shown that Seri Tatekami was with the female island core, recognized as Tsubaki Minashiro, before she returns back to the base. Chizuru later finds Tsubaki and takes her to the lighthouse. Tsubaki leads Fumihiko and Soushi into a second command center. Mamoru, Kenji, and Sakura barely put up a fight against the Festum, as they are consequently defeated. Kazuki, in the Fafner Mark Sein, arrives in time, synchronizes himself with Soushi, and eradicates the Festum using a rifle gun and then a lance sword.
Aired 24/10/2004EP 16 - Welcome Home (Friends)
Fafner
Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught... but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind.
(Source: Anime News Network)
Note: The last episode aired with a runtime of ~48 minutes as opposed to the standard 24 minute long episode. In the DVD release and subsequent home video releases of the series, the final episode was split into two separate ~24 minute long episodes.