After the Chinoike clan was expelled from the Land of Lightning, they were forced to settle in the Valley of Hell. When the people of Yugakure checked up on the clan a few months later, they mistook the valley's red water for blood and assumed some calamity had befallen the Chinoike; rather than investigate or offer help, they declared the valley off-limits and, over time, forgot where it was located. In truth, the Chinoike clan was able to survive off the valley's scarce resources and lived peacefully for years. Decades of living so close together eventually became too much for the clan and fighting broke out, with only En Oyashiro and his daughter, Chino, surviving.