Xu Liangjin, a loser in real life, happened to arrive in mysterious planet Sacred Frontier by mistake. From then on, he rewrote all his life. After meeting four female knights with different personalities and specialties, i.e. Cat Knight Forsythia, Fish Knight Orise, Bear Knight Bao and Wing Knight Wenfly, hey joined their team and experienced a series of life-and-death battles, dangerous traps and companions'mutiny... Everyone's fate has his or her own fate. Where to go? That's a question that only future knows.