Shichika Yasuri was born into the Yasuri family, known for their legacy of martial arts, particularly Kyotōryū. His father, Mutsue Yasuri, was the sixth head of the school, and his mother, Migiri Yasuri, played an important role in shaping his early upbringing. Shichika grew up in seclusion on an isolated island with his family, where he was taught the ways of the Kyotōryū martial art.

Unlike most traditional martial arts schools, Kyotōryū does not use any weapon other than the practitioner’s own body, which makes it unique and formidable. Shichika’s upbringing was one of discipline, but also one that kept him from the complexities of the outside world. As the younger brother of Nanami, a more conventional fighter, Shichika grew up in the shadow of his family’s expectations, though his own growth and journey would soon take him far beyond the island that shaped his youth.

Shichika’s journey begins when he is recruited by Togame, a strategist working for the shogunate, to help retrieve twelve powerful swords known as the Deviant Blades. As a fighter with the abilities of the Kyotōryū, Shichika is the perfect candidate to help in this mission. This marks the start of his adventure, as he begins to travel the world, learning more about himself, his family legacy, and the many individuals he meets along the way.

Shichika Yasuri has a simple yet distinctive appearance. He is a tall, lean young man with long, straight black hair that he typically wears loose, often covering part of his face. His eyes are sharp and intense, reflecting his internal growth and the lessons he learns throughout the series. His facial features, while not as striking as some other characters, convey a certain gentleness, which contrasts with his strength and skill in combat.

He is usually seen wearing a basic outfit, typically a long robe that reflects his martial arts background and his lifestyle as someone who values simplicity. His clothing is practical for his travels and his swordsmanship, with minimal decoration. Shichika’s overall appearance is humble, reinforcing his personality as someone who does not seek attention but is incredibly skilled and strong nonetheless.

Shichika Yasuri is initially portrayed as a rather simple and naive character, having spent much of his life isolated from the world. He has little knowledge of the complexities of society, and his view of the world is shaped by his upbringing in the Kyotōryū martial arts tradition. His personality is kind-hearted, honest, and direct, and he often acts without the consideration of societal norms or expectations.

Despite his initially simple demeanor, Shichika is a deeply emotional and introspective character. Over time, as he embarks on his journey with Togame, Shichika becomes more self-aware and starts to grow emotionally, learning to confront his past, his feelings for others, and his role as the seventh head of the Kyotōryū. His bond with Togame is a major part of his development, as their relationship evolves from that of a master and servant to something deeper and more complicated.

One of Shichika’s defining traits is his loyalty, particularly towards Togame, and his determination to protect those he cares about. He may not always understand the complexities of the world, but he approaches challenges with sincerity and resolve, making him a reliable and noble protagonist.