In Tensei shitara Ken deshita, our protagonist takes a unique twist as he is reborn not as a person but as a sword! Emerging in a dangerous forest teeming with beasts, he crosses paths with a girl in desperate need of help. After rescuing her, they form a bond, and she reveals herself as Fran, a survivor of the mistreatment inflicted upon her tribe, the Black Cats. Struggling to recall his past identity, the protagonist is christened 'Shishou' by the spirited Fran, who becomes his master. Together, they forge a powerful duo dedicated to righting wrongs, freeing the downtrodden, and meting out justice on their thrilling adventures.