"Son of summons, please wake up, break through the night, and welcome the dawn." This is the immortal's prophecy and the beginning of the story. The girl who was always lazy opened her eyes as blue as the sea and said with a smile, "Hey, I'm here." The blond boy with a bright smile under the tree puffed his face slightly, "Xiaobai, you are sleeping again..." The girl straightened up, supported the branch with one hand, and smiled lazily, "Brother..." This is the story of a killer girl who traveled to another world, burdened with a heavy mission, and grew up helplessly but strongly. It is a story of guardianship.