Небесный Фафнир: Мёртвый агрессор — По ту сторону

The people of Alvis need Soushi's help, since he is the only one that can lead them back to their homeland of Tatsumiyajima, however a group called Benon, who are a combination of Festum and Perseus-type Fafner's, are fighting to prevent this. (Source: Anime News Network, edited)