Being born as triplets to a demon under Asmodeus, Mercuron Kao and their siblings were brought up by the Lady of Lust herself. Each of the three siblings received heirlooms from their mother, in order to blend into iterations of the Martedian society, where they were all sent to at age 13. Where Mercuron went to the prime universe, Neptunel Lea and Plutonias Dae were sent to Bizarro and Doublizarro, respectively. Mercuron was drafted into a squadron moderated by Aka upon arrival. Their fellow squadron members at the time were Vixen Pya, and Hyun Kao, who was a distant cousin of theirs.