Bleach: Awakening Dual-Blade Zangetsu from the Start

On the first night Ichigo became a Soul Reaper, he drew two swords from the depths of his soul. One was a short black blade, and the other was a longsword taller than a person.

Rukia stared in disbelief. "What the hell is that sword?!"

"I should be asking you! Where's the scabbard?!"

One slash, and the Hollow was gone. Rukia's spiritual pressure was nearly gone too.

From that night on, the story went completely off the rails. Kuchiki Byakuya discovered that he couldn't break the sword anymore. The hair gel in Aizen's hand lost its appeal. Only Zaraki Kenpachi was delighted: "Finally, someone worth cutting!"

Everyone realized that this newly minted Substitute Soul Reaper was already absurdly powerful.

[BLEACH fanfiction / Dual swords from the start / Original protagonist / What-if plot / Hot-blooded battles]