Mafuyu Munetani

The second daughter of the Soya family, a distinguished lineage of Blue Mermaids. The younger sister of Mashimo Soya, and the older sister of Mashiro Soya.

She serves in the Enforcement Division of the Blue Mermaid Security Oversight Agency and is the captain of the Benten, an *ndependence-class littoral combat ship.

She excels at sports, particularly windsurfing, bojutsu (staff fighting), and karate. She is a skilled skipper and has even competed in international races. She has a straightforward, somewhat short-tempered personality—the type who acts as a "point man" or spearhead in a charge. She enjoys drinking sake while in hot springs.

She has a habit of groping others' buttocks as a way of "instilling some grit" in them; Mashiro and her classmates from the maritime academy were frequent targets of this behavior.