Path to the Summit: Apocalypse Coming?!

She once was a gentle wife and a loving mother. However fate had cruelly made her fall into the quagmire of despair and self-blame. She had long lost her faith to others, only keeping on living for the sake of the promise with her daughter. But fate and God seems a mischievous prankster. After falling into the depth of darkness, it gave her light of hope. Taking the oath's commitment as the sacrifice, using her blood essence as the price, she was finally able to grab the promised chance. This time she won't let them down anymore. What if the world got destroyed in the process. As long as she could return once again to them, she promised she would never let them go!