Himeka Komaeda was born into a very happy family, with a wealthy family, loving parents, and a brother who was two years older than her.
But an accident completely changed her life, and the brother and sister parted ways.
After the largest, worst and most desperate incident in human history broke out, Himeka Komaeda joined the Future Agency, and on her way to pick up the Class of 78 students, she reunited with her brother who was supposed to die.
Himeka Komaeda: "Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh a ghost in broad daylight!!"
Purpose: Sister-chan, try your best to turn your brother into a normal person