An unnamed thirty-something Japanese salaryman dies in a sudden
traffic accident while engrossed in a fantasy video game. Instead of the afterlife, he awakens to find himself reincarnated into a magical world, but with a twist: he is now a sentient, high-level enchanted broadsword devoid of memories regarding his human past. Trapped in a desolate beast-infested forest, the Weapon utilizes his telekinesis to hunt monsters, absorbing their magical essence and skills to level up his stats, desperate to find a worthy wielder who can unlock his true potential.His monotonous existence shatters when he stumbles upon Fran, a young girl belonging to the Black Cat tribe—a persecuted, beast-kin minority suffering from severe
discrimination, enslavement, and systemic abuse. While fleeing a vicious greater demon, Fran is cornered and near death. Sensing her indomitable spirit, the Sword projects his voice into her mind, urging her to pull him from the earth. Empowered by the legendary blade’s immense strength, Fran effortlessly slaughters the demon, earning her freedom and securing a powerful partner.Naming her new companion "Teacher" because of his vast knowledge and guidance, Fran embarks on a quest to evolve her race and achieve her ultimate dream: evolving into a majestic bipedal beast to honor her fallen parents. Their journey takes them across various fantasy kingdoms. Teacher acts as her moral compass, strategist, and protector, while Fran provides the physical body and martial prowess required to wield him. Together, they form an unorthodox yet devastating adventuring duo, quickly rising through the adventurer guild ranks.Along the way, they confront corrupt nobles, ruthless slavers, and rival adventurers who seek to exploit or steal the legendary sentient blade. Fran also faces bitter prejudice due to her tribal heritage, yet she consistently wins public respect through her sheer competence, heroic deeds, and unwavering kindness. Teacher battles his own existential dread, constantly fearing that he might lose his sense of self or corrupt Fran with his dark powers. Despite these psychological hurdles, their bond deepens into a fierce, familial affection.The narrative escalates when they uncover a sinister, widespread conspiracy involving illegal magic item manufacturing, human experimentation, and a malevolent god's cult pulling strings from the shadows. To protect the innocent and secure Fran’s future, Teacher and Fran must combine their unique abilities—merging swordsmanship and divine magic—to face insurmountable odds. Through every grueling battle, they prove that their union transcends that of a weapon and master, becoming a symbol of hope for the marginalized and a force capable of reshaping the fate of the entire realm.