Red Shadow

One called the Shadow Family was considered the best among them. They made their armor and weapons with mysterious tough extraterrestrial metal called 'Invincible Steel', which was harder than any other on the earth. And they were masters of superd ninjutsu fighting techniques. But after many years of warfare, they armor and weapons have been lost and the number of ninja dwindled. Orthodox nijutsu experts fell to only a trio of youngster called Red Shadow, Blue Shadow and Aska..