It's Mayumi Kino a elite member of the Blue Fleet Who has partnered up with Tetsu Hayami in order to save earth.

Mayumi Kino is everyone's favorite tomboy redhead diver from the OVA Blue Submarine No. 6/青の6号

With two outfits
uniform: uniform, military hat, sailor hat, badge, oversized clothes, jacket,
diving suit: diving suit, breasts, bodysuit, white gloves, zipper,

Authentic OVA artstyle with: Anime Coloring,