Ninja Reincarnation: Fuuma Kotarou’s Quest to Reclaim His Humanity is a gritty, supernatural historical fantasy manga that drags a legendary ninja through a cycle of death and rebirth to rediscover his lost soul. Set in the war-torn 15th year of the Tenmon era, the story follows Fuuma Kotarou, the fifth in a line of fierce warriors, as he fights for bare survival in a world consumed by endless conflict and haunted by dark, supernatural forces. His only rule is to do whatever it takes to stay alive, and he cuts down countless foes until he is finally captured and executed. Just as his life brutally ends, a mysterious being called “The Seer of Worlds” reaches out, unleashing the cycle of reincarnation. Fuuma Kotarou is reborn in a completely new realm with a second chance, but the battle is no longer just about survival: it’s a quest to reclaim the humanity that endless killing stripped away from him. This series stands out for its historical texture and its dark, introspective take on the reincarnation genre, recommended for fans of Blade of the Immortal, Hell’s Paradise: Jigokuraku, and stories that blend samurai-era action with philosophical horror.

Keywords: Ninja Reincarnation Fuuma Kotarou manga, historical ninja reincarnation, supernatural Tenmon era, reclaim humanity quest, Seer of Worlds cycle, dark action fantasy manga.

Meta Description: Executed after a life of savage battle, legendary ninja Fuuma Kotarou is given a second chance through reincarnation, embarking on a quest to reclaim his lost humanity in a dark new world.

Alternate Titles: Ninja Reincarnation: Fuuma Kotarou’s Quest to Reclaim His Humanity / 닌자환생 / Ninja Reincarnation