The filename can be broken down into specific technical and content identifiers:
: Indicates a Blu-ray Disc source. Compared to standard TV broadcasts, BD versions typically offer higher picture quality and corrected animations that weren't finished in time for the original airing.
: Specifies Full High Definition (1920x1080 pixels), providing the sharpest possible image for this format.
: Identifies the source as GateAnime , a site that recently underwent a major update to improve its user experience for the "Otaku" community.
"*" indicates required fields