Chouryuu Senki Sauros Knight

An ordinary middle school student has lived a quiet life. Who knows that one day, a calm life is broken by a girl from a different world. He was taken to a different world, and later found himself a reincarnation of the hero of the alien world, and he embarked on an unknown journey. Overcoming all kinds of difficulties along the way, under the guard of the three super dragon knights, he recovered his former partner - the golden super dragon....