One-On-One King

Uzumaki Raishun, one of the Nine-Tailed Jinchuuriki, and his younger brother Uzumaki Naruto are twins. The Uchiha clan was wiped out, and his childhood sweetheart was killed. After transplanting his Sharingan, he resolutely left Konoha; In an accident, he went wrong while practicing ninjutsu and returned to the past. He was active on the battlefield and killed everyone; The ninjas wanted to unite, but he went it alone, armed with the awakening gun, and became the king in single combat! From then on, the immortal body and immortal eyes merged into one, and he began his extraordinary journey of working alone since he was a child. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.