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Located in one of the most rocky ridges in the Northern Alps, the ultimate knife-edge ridge, also known as "Umanose," is said to be the most difficult public hiking trail. Once boasting an impregnable reputation, it has driven many climbers to their deaths. Even today, it is a dangerous place where falls occur almost every year. A lone, up-and-coming climber, Yario, takes on Umanose!! But an unexpected outcome awaits him!! What on earth will happen?