What If Sanemi Never Turned Genya Away

Sanemi and Genya Shinazugawa swore to protect their family together the night their father was buried, but a demon wearing their mother's face tore that promise apart at sunrise. This alternate timeline follows the brothers from the tragedy that should have split them forever through their years in the Demon Slayer Corps. After Genya calls Sanemi a Vmurderer over their mother's ashes, Sanemi chooses to stay instead of leaving him behind. They hunt demons together on the road before joining the Corps, where Genya discovers he cannot use Breathing but gains the rare ability to temporarily absorb demon strength by consuming their flesh. Sanemi becomes a Hashira while protecting his brother in secret, and both survive the final battle against Muzan and Upper Moon One. The story explores how their bond endures through guilt, stubbornness, and the weight of a childhood promise neither could keep alone.