Roi Bosse, a wandering giant adventurer, pursued ever-greater strength throughout his early life. This pursuit led him to duel and kill a powerful mage in the Houma Kingdom, suffering severe injuries. Nursed back to health by the mage's wife, he formed a close bond with their daughter, Miranjo. After gods destroyed the Houma Kingdom and the Gyakuza Kingdom betrayed them, resulting in Miranjo's torture and mutilation, Bosse slaughtered the responsible Gyakuza village and used their bodies to reconstruct her. This act deepened their bond, establishing Bosse as her surrogate father. Driven by lingering ambition, Bosse accepted Miranjo's suggestion to bargain with a demon. The demon offered enhanced power by stealing strength from a blood relative, leading Bosse to agree to sacrifice his future firstborn's potential. He courted and married the giantess Sheena. Upon their son Bojji's birth, the demonic pact activated, transferring Bojji's innate strength to Bosse and leaving the infant physically diminished, deaf, and frail. Witnessing Bojji's condition filled Bosse with guilt. He abandoned his wandering life, founding the Bosse Kingdom at Bojji's birthplace to provide stability and protection. The kingdom prospered, achieving a 7th global ranking. Bosse appointed four elite warriors and advisors, the "Big Four" (Domas, Bebin, Apeas, Dorshe), each tasked with guarding specific royals and advising the crown. After Sheena died shielding Bojji from arrows during Miranjo's first coup attempt using an army of Gigantes, Bosse later married Hiling. Miranjo was seemingly killed in that coup, her consciousness transferred into a magic mirror; Bosse's whereabouts during the event remain unclear, though he may have been battling the god Chabi-shin. Years later, Bosse succumbed to a mysterious illness and died. Miranjo, existing within the magic mirror, orchestrated his resurrection by transferring his soul into the body of his second son, Daida. Reincarnated, Bosse remained passive despite awareness of Miranjo's manipulations, feeling obligated due to their shared past. He intervened only during extreme threats, such as immobilizing the immortal warrior Ouken by encasing his regenerating body in stone. Bosse later confronted Bojji, who sought to free Daida's body. Despite Bosse's immense strength—augmented by his giant heritage and stolen power—he failed to land a blow against Bojji's agility. Bojji destroyed Bosse's signature club, leading Bosse to acknowledge his son's growth. Bosse then reconciled with Miranjo, expressing his true wish for peace. Together, they relinquished their physical forms, allowing their souls to dissipate permanently. Throughout his life, Bosse harbored deep secrets and conflicting loyalties. His relationship with Bojji was marked by remorse and covert protection, while his bond with Miranjo blended guilt, responsibility, and unresolved grief over her suffering. His leadership emphasized strength and stoicism, though his personal actions often prioritized atonement over transparency.