Misaki is the oldest daughter of the Tsusano family who hides a history as an accomplished vigilante at an international academy. She has spent fifteen years forcing herself into the mold of a traditional Shirojima housewife under the demanding expectations of her husband and culture. Though she presents a timid exterior, she secretly maintains her formidable martial skills and keeps a zilazen glass katana hidden beneath her kitchen floorboards.

Mamoru is fourteen years old and the oldest son of the powerful Matsuda family. Expected to uphold his family's honor as elite jijakalu (water and ice wielders), he trains rigorously in swordsmanship. His worldview shatters when a new student presents evidence that the Kaigenese Empire's history is built on propaganda, forcing Mamoru to question his purpose and the authority figures around him.

Takeru is the second son of the Matsuda family and a master of the elite Whispering Blade technique. He works as an administrator in the mayor's office and holds rigid beliefs about duty, honor, and loyalty to the Kaigenese Empire. His traumatic upbringing under an abusive father has caused him to develop a defensive ability to emotionally detach, resulting in a frigid presence that isolates him from his wife and children.

Setsuko is a fisherman's daughter whose marriage to the noble-born Takashi caused a local scandal. Despite the strict, traditional environment of the Matsuda family, she maintains a vibrant, joyful personality. She serves as a vital emotional anchor for Misaki, offering warmth and reassurance in an otherwise isolating household.

Robin is a half-Carythian, half-Disan refugee who grew up as an orphan. As a powerful tajakalu (fire wielder), he partnered with Misaki in a teenage vigilante group. Driven by a deep core of compassion and pacifism, he frequently debated ethics with the more ruthless Misaki, believing strongly in the fundamental goodness of humanity.

Hyori is a noble-born woman married to a respected swordsmanship teacher. She embodies the traditional Shirojima ideals of beauty, delicacy, and femininity. Accustomed to a sheltered and privileged life, she is completely reliant on the social structures of Takayubi and holds absolute faith in the Kaigenese Empire's protective power.

Chul-hee is a transfer student from a distant northern region of Kaigen whose father is installing modern communication towers in Takayubi. Coming from a more connected part of the empire, he holds a cynical view of the isolated mountain culture. He possesses information about global politics and historical truths that directly contradict the local curriculum.

Takashi is the head of the Matsuda family and the headmaster of Kumono Academy. Unlike his precise and controlled younger brother, Takashi is brash, impulsive, and favors brute strength. He harbors deep frustration over being relegated to administrative duties during peacetime, yearning for an opportunity to utilize his formidable combat skills.

Dai is a highly respected sword master at the elite academy and Mamoru's favorite teacher. He approaches his martial discipline with calm efficiency and patience, providing his students with guidance that balances out the strict expectations of their own families.

Katashi is a master swordsmith from the craftsman caste, continuing his family's long-standing relationship with the Matsuda nobility. He serves as both a healer and a blacksmith, creating exceptional weapons while sharing ancient regional legends.

Kazu is the current head of the passionate Tsusano family and Misaki's brother. He possesses the family's blood-manipulation abilities and uses them to enhance his own physical stamina. Despite living far away, he remains deeply concerned about his sister's well-being.

Colonel Song is a military official from northern Kaigen tasked with managing conflicts in the Shirojima province. He embodies the empire's rigid authority and its priority on maintaining appearances, demanding total compliance from local leaders.

Elleen is a Hadean littigi capable of controlling light and creating illusions. During her teenage years at Daybreak Academy, she operated alongside Misaki and Robin in their vigilante group, using her illusion abilities to conceal Misaki during ambushes.

Koli is a Yammanka inventor who attended Daybreak Academy with Misaki. He supported her vigilante efforts by designing custom equipment and weapons. Recognizing Misaki's true nature as a fighter, he crafted her unique zilazen glass sword.

Hiroshi is Misaki and Takeru's five-year-old son. He observes the tense dynamics of his household and possesses an intense, serious demeanor that occasionally unnerves his mother.

Nagasa is the two-year-old son of Misaki and Takeru, requiring constant care from his mother.

Izumo is the youngest child of Misaki and Takeru.

Ayumi is the daughter of Setsuko and Takashi.

Ryota is the young son of Hyori and Dai, frequently cared for alongside the Matsuda children.

Tae-min is an engineer working for a communications company, responsible for laying cables in Takayubi to connect the isolated village to modern technology.

Atsushi is the young son of the master swordsmith Kotetsu Katashi.

Susumu was the previous patriarch of the Matsuda family. His severely abusive behavior toward his wife and children profoundly damaged Takeru's psychological development.

Daniel is the toddler son of Robin Thundyil.