Another World: the Legend of the Ghost and Beast God

The male protagonist was an ordinary high school student, until one day he had a dream, an extremely real dream. He dreamed that he was wearing a black armor and fell into a wave of blood, with a red giant sword stuck in his chest, and he was surrounded by people. Some of them were holding him and crying, and some were blocking him, but there was only one sentence in their mouths, and that was, "Stand up!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.