Yama, raised in Mars' Gaia Sanction colony alongside his brother Ezra and childhood friend Nami, harbors lifelong guilt from a greenhouse accident in his youth. His attempt to revive his mother’s flowers triggered an explosion that paralyzed Ezra and condemned Nami to life support—a tragedy that compelled him to seek redemption by infiltrating the starship Arcadia under Ezra’s command to assassinate Captain Harlock. Proving a skilled combatant and tactician aboard the Arcadia, Yama mastered the vessel’s weaponry, earning the crew’s respect. His loyalty to Gaia Sanction eroded as he bonded with Harlock’s team, culminating in a moral crisis upon uncovering Harlock’s intent to annihilate the universe via a dimensional oscillator. Torn between Harlock’s nihilistic time-reset scheme and Gaia’s authoritarianism, Yama grew disillusioned with both after recognizing Harlock’s manipulation of his trauma. Nami’s murder by a jealous Ezra during a confrontation shattered Yama’s remaining ties to his brother. Fleeing to Earth, he discovered a resilient flower—proof of the planet’s latent vitality—which galvanized his rejection of annihilation ideologies. Returning to the Arcadia, he liberated the crew, exposed Earth’s capacity for rebirth, and persuaded Harlock to abandon cosmic destruction. In their final clash aboard the crippled Arcadia, Yama dueled Ezra in zero gravity, sustaining a facial scar mirroring Harlock’s. After Harlock fatally wounded Ezra, who confessed his love for Nami, Yama seized control of the universe-destroying detonator. Refusing to trigger it, he preserved Earth as a beacon of hope. Harlock ceded command, bestowing the detonator and an eyepatch—symbols of Yama’s transformation into the new captain. Adept in marksmanship, combat strategy, and syncing with the Arcadia’s dark matter engines, Yama evolves from a guilt-haunted spy to a leader championing renewal over oblivion, cementing his legacy as Earth’s defiant guardian.