The Four Cardinal Heroes are a group of ordinary men from modern-day Japan summoned to the kingdom of Melromarc to become its saviors. Melromarc is a country plagued by the Waves of Catastrophe that have repeatedly ravaged the land and brought disaster to its citizens for centuries. The four heroes are respectively bestowed a sword, spear, bow, and shield to vanquish these Waves. Naofumi Iwatani, an otaku, becomes cursed with the fate of being the "Shield Hero." Armed with only a measly shield, Naofumi is belittled and ridiculed by his fellow heroes and the kingdom's people due to his weak offensive capabilities and lackluster personality. When the heroes are provided with resources and comrades to train with, Naofumi sets out with the only person willing to train alongside him, Malty Melromarc. He is soon betrayed by her, however, and becomes falsely accused of taking advantage of her. Naofumi then becomes heavily discriminated against and hated by the people of Melromarc for something he didn't do. With a raging storm of hurt and mistrust in his heart, Naofumi begins his journey of strengthening himself and his reputation. Further along however, the difficulty of being on his own sets in, so Naofumi buys a demi-human slave on the verge of death named Raphtalia to accompany him on his travels. As the Waves approach the kingdom, Naofumi and Raphtalia must fight for the survival of the kingdom and protect the people of Melromarc from their ill-fated future.

The Red Ranger, Tougo Asagaki, finds himself transported to another world in the middle of a fierce battle against forces of evil. Upon arriving, he quickly makes a name for himself as an adventurer and takes on a job from a young mage named Yihdra Arvoln. With his eccentric powers and frenzied personality, Tougo blazes through the mission with her. After the quest, Tougo and Yihdra begin adventuring together with their respective goals. Tougo strives to help as many as possible in the new world and find a way back home, while Yihdra desires to redeem her family lineage of mages and make magic accessible to everyone. Along their journey, the duo discover the limitations yet endless potential of the bonds they forge as they overcome adversities to achieve their aspirations.

The story follows the aloof supreme lord of the myriad realms. He handpicks young girls, each with the potential to ascend as future deities, and embarks on a treacherous quest to reshape the destiny of the realms. Confronting formidable challenges and obstacles, will these fledgling girls triumph in their trials and forge a new world from the ashes of the old?

He Wan, the leader of the Hidden Clan feared by all three realms, suddenly attacked the Heavenly Palace. The Supreme God Nan Ze came to fight. In order to protect Nan Ze, the jade-growing fairy Yu Zhiyao risked her life to save him. When she and He Wan were about to perish together, she was unexpectedly reborn. By mistake, Yu Zhiyao was reborn into He Wan's body. After the rebirth, He Wan's Hidden Power was greatly damaged. Ting Zhao, the Hidden Guard of the West Sea, came to help the leader He Wan recover her Hidden Power. Since then, Zhiyao was forced to embark on the road of a two-faced female leader, pretending to be majestic in front of others and being charming in front of the king...