"Shin Kyūseishu Densetsu Hokuto no Ken: Toki-den" is a direct-to-video anime series that serves as a prequel to the original "Fist of the North Star" (Hokuto no Ken) saga. The story centers on Toki, the younger brother of Raoh and Kenshiro, and his journey before the events of the main series. Toki, a master of the Hokuto Shinken martial arts style, is depicted as a compassionate and wise figure, contrasting with the brutality of his brothers and the post-apocalyptic world they inhabit.

The narrative explores Toki's life in the Land of Asura, a harsh and war-torn region where he is revered as a god-like figure due to his healing abilities and mastery of Hokuto Shinken. Despite his immense power, Toki chooses to use his skills to heal and protect the weak, embodying a philosophy of mercy and non-violence. However, his pacifism is tested when he encounters the ruthless warlord Juda, who seeks to exploit Toki's abilities for his own gain. Juda's forces capture Toki, subjecting him to torture and forcing him to confront the moral dilemmas of his ideals in a world dominated by violence.

As the story progresses, Toki's resilience and inner strength are highlighted as he endures immense suffering while maintaining his commitment to his principles. His interactions with other characters, including his brothers Raoh and Kenshiro, provide insight into the complex dynamics of the Hokuto Shinken lineage. The series also delves into the origins of Toki's illness, a critical element in the broader "Fist of the North Star" narrative, revealing how his exposure to radiation during his captivity weakens his body but not his spirit.

The anime emphasizes themes of sacrifice, morality, and the struggle to uphold one's values in a corrupt and violent world. Toki's character serves as a moral compass, offering a stark contrast to the destructive paths taken by other martial artists in the series. The story concludes with Toki's eventual escape and his return to the wasteland, setting the stage for his role in the original series as a mentor and guiding force for Kenshiro. Through its exploration of Toki's past, "Shin Kyūseishu Densetsu Hokuto no Ken: Toki-den" enriches the lore of the "Fist of the North Star" universe while providing a poignant character study of one of its most revered figures.