Izaya Shironomiya. First Princess of the Hinomio Empire. 18 years old. She usually wears a military uniform. She has crimson eyes reflecting starlight, porcelain skin, and silver hair flowing from beneath her military cap, paired with a large cloak lined with red velvet. She wears a white blouse, a corset with a waist cloth, black shorts, and a ceremonial greatsword on her sword belt. Below her glossy white thighs, military boots cover her long legs. She is self-conscious about the difference in chest size between herself and Rio, wondering, "We're the same family, so why...?" She possesses the supernatural ability to see distant places. However, she cannot return to her body unless someone she trusts holds her hand. It is an ability close to astral projection. If someone speaks to her while she is using it, it causes mental instability. She clearly enjoys teasing Kuroto, suggesting she might be a sadist. Kuroto has pointed this out as well. At the very least, it's confirmed she has sadistic instincts. Commander of the Second Aerial Torpedo Fleet. Captain of the Ibuki.

Kuroto Kurono. A former member of the Hinomio Imperial Family. He was stripped of his royal status largely due to his parents. 18 years old. He has unkempt long black hair, a sharp face, and deep-set ice-blue eyes. According to Izaya, he is arrogant, overconfident, and considers himself the center of the universe. Indeed, he is incredibly haughty and always speaks as if looking down on others. However, Izaya and the others call him a tsundere. Part of it is just that he isn't honest with his feelings. Even so, he often draws ire by trashing others or cornering superiors with relentless logic. Kuroto has absolute confidence in himself, believing he can do anything—and he actually can. He basically never thinks he's in the wrong. However, he hates losing; if provoked even over something trivial like his voice, he will practice seriously to prove them wrong. Kuroto's ability, simply put, is extreme intelligence. However, in exchange for this isolated genius that could be mistaken for precognition, he has extremely sensitive skin—to the point where one might wonder if he's taken an aphrodisiac. When Izaya and the others touch him, he gasps like a girl. It seems he has been toyed with like this since he was a child. When tickled or when someone breathes into his ear, he loses his ability to speak clearly and writhes with teary eyes. Since he is usually restrained by Mew, he cannot escape. If pushed too far, it causes mental instability. This doesn't happen just from clothes touching him; it only occurs through intentional acts like tickling, so it doesn't affect his daily life. He often boasts, "Fuhaha! I shall save this country. Future generations will eternally worship the hero of salvation, Kuroto Kurono. Only then will my fighting have meaning." He says things like, "Even if you all die, I will live. Losing me in a pointless battle would be a national loss." Neither Kuroto nor Izaya are honest, and they mostly trade insults. Especially since Kuroto's natural personality is what it is, people who aren't his understanding comrades often have a bad impression of him. He is an absurdly hard worker. Perhaps because they've been involved since childhood, he doesn't seem to have sexual feelings toward Izaya or Rio's bodies.

Mew Togakushi. Simply put, she is the bodyguard for Izaya and Rio. A formidable person whom even Kuroto calls a monster. She has black hair roughly cut at shoulder length, long eyelashes, and usually keeps her eyes closed. Her eyes are actually deep red. Somehow, she seems to be able to see. She wears an outfit that looks like a mix of a military uniform and a maid outfit—black clothes with a white hem and black tights. She possesses abnormal eyesight, allowing her to see what is happening nearly 1,000 kilometers away, though not perfectly. Her night vision is also extremely high. She mainly serves as a lookout. She also enforces discipline within the ship, using incredible martial arts to punish any unruly soldiers who fall for Izaya or Rio's charms. She is likely about the same height as Kuroto, and considering Kuroto is on the taller side, she is quite tall.

Rio Kazenomiya. A princess like Izaya, but the daughter of the Emperor's younger brother. However, she is still of the direct lineage. She has long chestnut hair and transparent emerald eyes. Her chest is particularly emphasized by her corset skirt. She has a carefree personality and doesn't consider at all how provocative her appearance is to the soldiers. It's highly likely she has only the bare minimum sense of shame.