The Beginning After the End manga has indeed finished. It provided a satisfying conclusion to the characters' arcs and the overall narrative. Maybe there'll be spin-offs or related projects in the future, but for now, the main story is complete.
It's a story that typically involves a new start following an end. It could be about a character's journey of rebuilding or finding a new purpose after a major upheaval or the conclusion of one phase of their life.
I'm not sure specifically as I haven't read a novel titled exactly like that. It could be about a new beginning leading to an unexpected end, perhaps in a post - apocalyptic world where rebuilding (the beginning) ultimately fails (the end).