A devoted and reliable younger sister. After the death of their adoptive father, Miyamoto Musashi, she was taken in by the Ogasawara family as an adopted daughter and lives separately. However, worried about her brother Iori, who tends to be reckless, she visits his tenement house in Asakusa daily to take care of cleaning, cooking, and other chores. A symbol of daily life amidst ominous shadows. To Iori, who throws himself into battle, she represents the "peaceful life to be protected." She has a pure and kind personality, quickly befriending the newly arrived Saber and other characters. However, her devotion puts her at constant risk of being targeted by enemy factions seeking the Waxing Moon.

While maintaining an air of nobility, Saber has an innocent and gluttonous side, with eyes that sparkle at the sights and food (especially white rice) of modern Edo. Initially, Saber refuses to acknowledge the inexperienced Iori and rebels against him, but they form a deep bond while surviving life-or-death situations together. In combat, Saber boasts overwhelming close-quarters ability, wielding a greatsword longer than their own height and utilizing the "power to manipulate water" derived from their mythology, overwhelming enemies with perfect coordination alongside Iori.

An Alter (inverted) form different from "Jalter." While the Jeanne Alter in FGO is a "fake created from Gilles de Rais's wish," the Lancer in this work is the "actual Jeanne d'Arc." Her spirit has been corrupted by the immense hatred and despair held by her Master, Chiemon, forcibly inverting her into this distorted form. Significantly degraded abilities. Originally a top-tier Saint (Ruler class), her abilities and stats have dropped significantly as a price for the distortion of her special and incomplete summoning. Because of this, even an inexperienced mage like Chiemon is able to bind her as a Servant. A somber and melancholy mental state. Unlike the dark and aggressive Alter in FGO, this Lancer retains some of her original kindness and nobility as a Saint while being shrouded in deep gloom and despair. She understands Chiemon's wish to "burn everything and go to hell" and shares a unique bond, staying by his side through that harsh fate. Combat style: She stands before Iori and Saber wielding two long spears (Noble Phantasm: Tristesse de la Vierge, etc.) and skillfully manipulating black flames that incinerate everything.

A man with a brutal past. He is one of the few survivors of the great rebellion that once occurred in Amakusa Shimabara (the Shimabara Rebellion). Due to his tragic past experiences, he harbors deep despair and intense hatred toward the peaceful world of Edo and humanity itself. Eerie appearance. He has a very mysterious look, with multiple layers of cloth (bandages) wrapped around his entire face. Relationship with Lancer: The Lancer he summoned (True Name: Jeanne d'Arc) has manifested in a melancholy and shadowed mental state, as if dragged down by the deep darkness and despair Chiemon holds. They are one of the most serious and powerful factions in this work, both harboring dark flames within.

Throws themselves into battle to create a world without war. Contracted Servant: Rider (True Name: Ushi-Gozen). Personality and Characteristics: A wish for no more war. Despite having a fiery temperament and cold rationality, they possess a kindness that deeply loathes the sacrifice of civilians caused by war. Personal Secret: While the historical Yui Shousetsu was male, in this work, the character is a woman (or genderless) created as a homunculus-like being.

Class: Rider. True Name: Ushi-Gozen / Minamoto no Raikou. Master: Yui Shousetsu (a military scholar who runs a military academy in Edo). Appearance and Behavior: A cold and fierce warrior clad in jet-black armor. Resonating with the ideal of "reforming the world for the sake of all people" held by her Master, Yui Shousetsu, she swears absolute loyalty to achieve her Master's ambitions. Powerful Combat Ability: She freely wields a greatsword and boasts overwhelming destructive power and high mobility using demonic forces (her power as a divine messenger of Gozu Tenno). In the story, she is depicted as an extremely powerful enemy Servant standing in the way of Iori and Saber.