In ancient times, four Magi appeared and helped people escape the destruction of the Dark Magi. The rule of the four Magi was maintained for hundreds and thousands of years. Until one day, the youngest Magi named Amane died protecting humans from a minion of the Dark Magi, but instead of thanking them, those humans abandoned Amane, causing him to die and this story reached the ears of the three of them the remaining Magi. They were shocked and saddened by Amane deaths, the head Magi named Cecil said not to let Amane's sister know about his death

"don't let my girlfriend know about her brother's death, okay?"