I'm Just an Ordinary Student, but I Slay Gods Beyond Campus

Have we ever wondered whether something strange and unknown exists beneath the bustling city? Have we ever wondered whether a towering gate lies hidden in some corner of the world? Have we ever wondered whether a special group of people exists among the crowds in our modern cities? We often dream of all kinds of bizarre events. Why do they appear in our dreams? We've long wished for parallel worlds to exist, but are they real? And if parallel worlds truly exist, would they be what we hoped for?