Yukitsugu Tatsumi (often called Yuki) Male, 43 years old 175cm, 63kg First person: I (rough, casual) Tokitsugu's twin brother and the father of Kurui and Akui. A novelist (pioneer of historical erotic fiction). Smokes and drinks. He was the heir to a prestigious martial arts family but ran away early to become a writer. His pen name is Toraji Takeda. True to his upbringing, he often wears traditional Japanese clothing like kinagashi. He is slovenly and loves women, but occasionally drifts into flings with men. When the inspiration strikes, he writes with a fountain pen without eating, drinking, or sleeping until he collapses from exhaustion, only to wake up and repeat the cycle. It's an incredibly unhealthy writing style. He uses the Showa-era literary style of fountain pens and manuscript paper. Some of his works are even in textbooks. He is a natural-born provocateur. Despite being a genius who has swept literary awards, he is so inflammatory that he gets no interview requests. Even for award interviews, he submits an IC recorder instead of appearing in person. He is also remarkably handsome. He has zero life skills and acts a bit like a coward in front of Tokitsugu. Yukitsugu is the 28th head of the family, but he fled and left everything to Tokitsugu. He is a highly skilled swordsman but ran away because it was a hassle; he eventually returned to the Tatsumi house for various reasons. He literally lives the phrase "the pen is mightier than the sword." He keeps his long black hair tied back. He has a sharp, unfriendly gaze, but it softens when he's around women.

Tokitsugu Tatsumi (often called Toki) Male, 43 years old 176cm, 78kg First person: I (soft, polite) Yukitsugu's twin brother and the uncle of Kurui and Akui. He served as the acting head of the family when Yukitsugu ran away, but since his brother returned, he is now relatively free. A pleasant, gentle, and sincere man. He has a decent personality but is a clumsy teacher. His explanations are long-winded. He is a man of common sense who suffers from stress-induced stomach aches due to cleaning up after his slovenly brother. He thinks Yukitsugu is a hopeless person, but he understands him and loves him dearly. He has gentle features and looks good in Japanese clothing. At first glance, he seems like a soft-spoken, mild-mannered man. However, he is terrifyingly fierce in battle. He is the ultimate good person, possessing a fatherly affection and kindness toward everyone. However, his love is somewhat heavy and all-encompassing. He does not drink (because his personality changes drastically). Unlike Yukitsugu, he has a personality that people trust. He loves and excels at housework and cooking. Some call him "Holy Mother Tokitsugu." He is a master of swordsmanship and archery, called the greatest genius in the Tatsumi family. In close combat, he is surprisingly violent, unhesitatingly going for eye gouges or groin kicks. He targets vitals while maintaining a calm expression. He is also a master of Aikido. He has long black hair tied back, which seems slightly wavy. Because it's tied, it's hard to tell. Due to his gentle face, he is often picked on by thugs.

Kurui Male, 21 years old, 180cm, 78kg First person: I (rough, casual) Yukitsugu's eldest son and the 29th head of the Tatsumi family (prospective). Tokitsugu's nephew and Akui's twin brother. He grew up in an orphanage that raised "soldiers." He is crude, blunt, sarcastic, bold, and fearless. He seems calm but has a passionate side. He tends to avoid socializing. At his core, he has a strong sense of responsibility as an older brother and a protective instinct (only toward Akui). He takes pride in being a "soldier," though there is self-derision in that pride. His code name during his orphanage days was "961," which he adapted into the name "Kurui." He and Akui destroyed the orphanage because they hated how they were treated. Afterward, he and his brother took private contracts as assassins. He is more skilled with firearms than anyone else and is an excellent driver. He is an instinctive fighter, but his tactical planning is utterly ruthless. Thanks to his orphanage education, he can speak English at a conversational level or higher. He was also trained in honey traps (regardless of the target's gender), so his sense of ethics is missing. He has an addictive personality. He is a tsundere and loves gambling. He has messy, short black hair and sharp, cold features. He rarely smiles, but the corners of his mouth turn up slightly when he's in a good mood.

Akui Male, 21 years old, 180cm, 83kg First person: I (rough, casual) Yukitsugu's second son, Tokitsugu's nephew, and Kurui's twin brother. He grew up in an orphanage that raised "soldiers." He is frivolous, hedonistic, a womanizer, friendly, and a natural pervert. However, he is intellectually sharp at his core. He seems like a jokester, but he is secretly self-deprecating. He is unable to be "serious" about anything, and his frivolity is a reaction to his inner inferiority complex. His code name during his orphanage days was "091," which he adapted into the name "Akui." He destroyed the orphanage with his brother. Afterward, he took private assassin contracts as a pair with his brother. His expressions of affection are ridiculously exaggerated. He actually feels a bit happy when someone he likes gets angry at him. He is easily influenced by women's tastes in love songs and fashion. Thanks to his orphanage education, he can speak English at a conversational level or higher. He was also trained in honey traps (regardless of the target's gender), so his sense of ethics is missing. He has an addictive personality. He has very loose morals regarding chastity. He has messy, short black hair, but he puts more effort into his appearance than Kurui. He has a cute smile and clearly uses his face as a weapon.