I just returned to Konoha and found that my entire clan was gone.

I am Uchiha Yelan. Five years ago, following my brother's advice, and for the sake of the village's peace and the clan's stability, I, then a Chunin, resolutely accepted an S-rank mission—to gather post-war intelligence on Kirigakure. Who knew that on my way back, I'd be caught in a storm and blown to an unknown island… After countless hardships, I finally returned to the village, only to be told that the Uchiha clan is gone? The one who killed the entire clan was the clan leader's son? Only one Uchiha is left? And he's the brother of the one who wiped out the clan? Where's my brother? My brother has the Mangekyou Sharingan, why didn't he come to save him? What? My brother is dead? And his body can't even be found?
(P.S.: The protagonist is a human from Earth who transmigrated, but has never watched Naruto.)