Sirin was the younger sister of a fallen BSIA member; Hakunetsu Mikomi, who was killed in the line of duty on Hotaru Star Fortress in early YE 30.
It was shortly after her sister's death that she asked to utilize the older Ki-F5 light transport ships located at Nataria and refit them with heavy cloaking capabilities to get around possible blockades as supply runners. Her suggestion lead to the Ke-F8 Transport Ship redesign.
She is currently working on building up and operating the Civilian Supply runner service for the Star Army of Yamatai, Hikyaku no Mikomi.
Her preferred ship for her personal captaincy is the YSS Shadowdancer (YF-12) that is now registered as the: HMNS Shadow Dancer (HF-04).