OVA
Description
Genjūrō Tsukishima is the father of Jinbei Tsukishima, the main protagonist of the story. A master swordsman of renowned skill, Genjūrō hails from the Tsugaru Province and was the original choice of Kotori Matsunohara, the commander of the Mushibugyo, to be a member of the insect magistrate office. However, by the time of the summons, he is unable to answer the call due to a debilitating injury to his leg.

In terms of appearance, Genjūrō is a tall man with a traditional samurai bearing. He wears a blue kimono and keeps his long dark hair tied back in a ponytail. He also has a noticeable scar located under his left eye. The most defining feature of his appearance, however, is the state of his left leg, which is broken and which he is often seen using his own sword to support as a makeshift cane.

Genjūrō's personality is marked by strictness and a profound dedication to the way of the warrior. He is a man who would do anything to increase his own strength and skill. This drive for power, however, is tempered by a personal code of responsibility and atonement. He is not a man of many words, and his relationship with his son is expressed not through sentimentality but through action and the rigorous training he imposes. He shows affection for Jinbei in his own way, often by engaging in sparring matches as a means of communication and checking on his son's progress.

The primary motivation behind Genjūrō's actions is a deep-seated need to atone for past sins and to restore a sense of honor. His past is complex, as he was formerly a member of the Hunter Eight, a criminal organization that planned to assassinate a magistrate. More significantly, the incident that led to his broken leg defines his relationship with his son. During a mission to escort a lord, Genjūrō was accompanying his young son Jinbei. When Jinbei failed in his duty to protect the lord's son, allowing him to wet himself out of fear from a giant insect, Genjūrō took the punishment upon himself. He deliberately sacrificed his own leg to atone for his son's failure, an act that drives Jinbei to join the Mushibugyo in his father's place to make him proud. This self-mutilation was a severe form of penance, intended to pay for his own sins as an assassin as much as for his son's mistake.

Genjūrō's role in the story is primarily that of a foundational figure and a catalyst. Though he does not actively participate in the main events in Edo due to his injury, his presence looms large. He is the one who sends his son, Jinbei, to take his place in the Mushibugyo, thereby setting the entire plot in motion. Jinbei's journey to Edo, his determination to become stronger, and his desire to protect others are all direct consequences of his father's actions and teachings. Genjūrō is the bar against which Jinbei measures himself, the legendary swordsman whose shadow he must step out of.

His key relationships are centered on his family and his legacy. The most important of these is with his son, Jinbei. Genjūrō has trained Jinbei since childhood, instilling in him the principles of the Tsukishima-style swordsmanship. He wants his son to become the greatest swordsman in Japan, and sending him to the Mushibugyo is a way to ensure that his own path to strength, which was cut short, can continue through his son. Genjūrō is also the husband of Kanae, who has since passed away. It is noted that Kanae was one of the only people who could ever come close to matching Genjūrō's immense strength, and she was also able to learn some of his secret techniques simply by copying him in battle.

In terms of development, Genjūrō is a character whose most significant changes occurred before the main story begins. He transitions from a member of a criminal organization and a father who passes on a harsh lesson to a man crippled by his own hand who then entrusts his legacy to his son. His path as a warrior ended with his broken leg, but this physical defeat does not diminish his will or his skill. He remains a powerful combatant despite his handicap, but his role shifts from active warrior to a teacher and a symbol of the past that his son must overcome.

Genjūrō's most notable abilities revolve around his peerless swordsmanship. He is the creator of the Tsukishima Style, a famous and powerful form of swordsmanship that he designed himself. This style includes numerous basic stances and techniques, but its pinnacle is a set of 36 legendary secret techniques that only he has fully developed. His son Jinbei, though a skilled practitioner of the style's basics, has only begun to grasp these advanced secrets. Even with the severe handicap of a broken leg, Genjūrō remains an immensely powerful fighter, capable of slaying dozens of giant insects in a single engagement. His skill is such that he was Kotori Matsunohara's first and ideal choice to join the elite ranks of the Mushibugyo, a testament to his reputation as a master swordsman without peer in his era.