Emir, a once-frail and weak businessman from Big Field, wakes up one day to find himself reincarnated in a parallel world called Aquamarine. However, this world is far from ordinary, as he soon discovers the existence of mystical creatures, ancient legends, and hidden martial arts sects. To aid him in his journey, Emir is bestowed with the Metropolitan System, a cheat-like ability that allows him to grow stronger and gain incredible abilities.