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.

Third season of .

Alicia, who had dreamed of becoming a hero since childhood, is chosen by the king as one of the thirteen heroes. Armed with a legendary sword, the heroes set out to defeat the Demon King Clevatess. However, their recklessness triggers a terrible crisis that could wipe out all of humanity on the continent of Edsea. Now, the world's only hope lies with a baby entrusted to the Demon King.

In the near future, civilization has collapsed, and the world has become a wasteland. Despite their poverty, the people use remnants of past civilizations to lead resilient lives. Gear works in a junk shop while also retrieving stolen goods alongside Qu-0213, a robot with four personalities, and White Bear, a gambler. One day, Gear finds himself thrust into a once-in-a-lifetime job to steal an important item. They soon find themselves up against deadly assassins, heart- pounding car chases, and explosive battles. What Gear and his team do not know yet is that the item they stole holds a secret that could shake the very foundation of this world.