Ruri, being older, was born on Mars. His family moved to Earth five years after his birth, where Elize was born. They moved into Space not long after, where their parents underwent a divorce, seperating the two. Ruri returned to Mars with his mother, and Elize continued to live in space with her father.
When Ruri was 16, his mother developed Mektan Demtra Fevor, a disease only on Mars and died. Rather then living with his father, Ruri made his own living. A year later, when Elize was 12, their father was killed in an accident, along with several other workers, and rather then staying in an orphanage, Elize was sent to live with her brother, then 17.
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