Summary
Being reborn in a world full of monsters, the young Uchiha realizes that to survive, he would need overwhelming skill. But he doesn't have much time, as he is only older than Itachi by one year. How will Kaen Uchiha live and survive in a world where he is in constant danger? Not a gamer system, no wishes, just old plain Sharingan that is all you need. No pairing for now.