-doujindesu.tv--beachfront-s-dream--blue-archiv...

Less likely, but possible: It might refer to a fan-made artbook or anthology celebrating Blue Archive ’s summer aesthetics. The "S" might stand for "Summer" or "Special."

But digitization came with a cost. Every time someone watched the file, they lost a real memory to make room for the beach's. The hum was the transfer. -Doujindesu.TV--BEACHFRONT-S-DREAM--Blue-Archiv...

She opened the Blue_Archiv source code hidden in the page's metadata. At the bottom, a note from the original archivist: "A place isn't lost until no one dreams of it." Less likely, but possible: It might refer to