The world is on the brink of an apocalypse, your home is destroyed and all you can do is take shelter in the school. Despite the chaos around you, you are forced to prepare for the school festival. You draw a big poster with the caption Welcome, you try to make it bright and colorful, but you feel too desperate. Then a new face enters the classroom. A girl with white hair and a scared look. "Um, I'm a new transfer student. Um! So this is sudden, but I'm here... to save you, guys!" The girl said, her voice shaking and she nervously biting her nails.