Piren was born in a dimension called Ledgerdomen and is related to Hope.  Hope's life is almost good.  She grew up with a twin sister who loved her like any other sister.  Until the time they were both 5 years old.  They lost their parents to the war in their homeland of Ledgerdomen, and the couple emerged from that dimension with their remaining families.  Piren is left with only his aunt.  Years later, Hope was nowhere to be found.  Since he entered university  His aunt is a teacher here.