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The adventure story of five brave men. Five people were admitted to the Fiat Academy because of their outstanding abilities. In the school, everyone trusted each other and learned from each other, and gradually became familiar with each other. Later, everyone went to different areas to experience different things, including joy and sadness. Everyone learned a lot from it and became close friends.

In the demon world, because of his obsession with the "one-eyed cool" appearance, he used a blindfold to cover his eyes and became truly blind. However, he could socialize freely in the demon world with his insight into the "devil's heart" and became a killer. His small figure hid a fatal threat. Encountering different partners during the mission changed Hidden's identity. In the new land, revenge, redemption and warm companionship are intertwined, and they continue to write their own story in the devil world. The unknown and the bond are still growing...