Description：April 10th. Spring break ended yesterday, and this morning is the so-called back-to-school day. After being woken up by his cute sister, Gokawa Shido thought that today would be an ordinary day like usual. Until he met a girl called an elf. With a sudden shock wave, the street disappeared without a trace. In a corner of the street that looked like a crater caused by a meteorite impact, a girl was standing in the middle of a pit. Are you here to kill me too?