Sengoku Tashihano, now fifteen years old, bears the weight of a tragic past that has shaped him into the determined demon slayer he is today. Born into the obscure Tashihano clan, Sengoku was raised amidst the whispers of the rare soul breathing technique, an art passed down through generations but seldom understood beyond the clan's borders. His life took a dark turn when his clan fell to a devastating attack by demons, leaving him as one of the few survivors. With his home destroyed and his family lost, Sengoku's resolve to master the soul breathing technique and avenge his clan grew stronger than ever.

Now ranked as a Mizunoto, the lowest rank among demon slayers, Sengoku's journey is filled with challenges and hardships. His unique quirk, a stutter that emerges whenever he speaks of his past or his fears, serves as a constant reminder of the trauma he endured. Despite this, his determination to climb the ranks and become a Hashira, the highest rank among demon slayers, drives him forward. Sengoku's desire for vengeance and his quest to protect others from the fate that befell his clan fuel his every action.

Yet, his path is fraught with obstacles. The rarity and complexity of soul breathing make it difficult for him to find a mentor who can guide him effectively. Moreover, the demons he faces are relentless, each battle pushing him to the brink of his abilities and his sanity. Sengoku's journey is one of perseverance, as he seeks out any knowledge or training that could help him master his clan's technique.

His efforts begin to bear fruit as he slowly unravels the secrets of soul breathing, using it to overcome demons that once seemed insurmountable. Each victory brings him closer to his goal, yet the shadow of his past and the fear of losing more loved ones haunt him. Sengoku's story is one of resilience and the unyielding spirit of a boy who refuses to let tragedy define him.

As he continues his journey, the conflicts in Sengoku's life are not just external but deeply internal. The struggle to reconcile his past with his present, the fear of losing more to the demons, and the pressure to live up to the legacy of his clan all weigh heavily on him. Yet, it is through these trials that Sengoku finds his strength, his resolve, and ultimately, his path to redemption.