One of Kagura's closest companions during her time at the elite JSDF was one of the paratroopers breaking through the enemy lines from behind during the times of WW3 from 2024 into 2026.
But she defected after knowing the truth that the JSDF had nepotism with Shinozaki's family, considering she witnessed that Kagura and her family had more special treatment than herself.
Envy is a sin, but that's the only way she could cope with secretly defecting to Hell Seether to gain more profit and even accomplish her desire without any limits.