Naruto: I'm Body Flicker Shisui's Younger Brother

[Hokage + no System + a golden finger + no heroine + friendship + decisive and ruthless] On his way home from work, Yejian is reborn in the Hokage world after an accident, becoming the younger brother of Shisui Uchiha. After six carefree years, Shisui's suicide deals him a devastating blow. Not only does he awaken the memories of his past life, he also immediately unlocks the Two-Tomoe Sharingan. Yejian thinks he can soar to new heights from then on, but an illness of unknown origin plunges him into an endless abyss. Because of his condition, he is unable to fulfill his promise to Shisui or the vows he once made. Everything finally changes six years later, on the eve of the graduation exam. From then on, restored to health, he carefully works to grow stronger, beginning with avenging Shisui and later standing against the invasion of the Ōtsutsuki Clan. In the end, he gradually becomes the true God of the Shinobi World.