As a child, the eldest of the three Story sisters, Elv, came up with a secret world called Arnelle, where everything was simple and clear, where there was no place for betrayal and evil. Arnell appeared in Elv's head after that terrible incident that she did not tell anyone about. Such things could only happen here, in real life, but Elv was then able to protect the youngest, Claire, because in the magical world she was given a special power. And on the same day, the Story sisters exchanged blood and swore an oath that they would never leave each other in trouble. But it so happened that two sisters betrayed the third...