Like every card game enthusiast, Hajime Hinobori has always wanted to see the Spirits from his cards come to life and witness them in real combat. This dream is successfully realized by Hajime's scientist parents, who develop an augmented reality system that revolutionizes the competitive scene of Battle Spirits. Curious players from across the globe travel to partake in this innovative battle system. With his sight set on becoming the champion of this new form of Battle Spirits, Hajime encounters many colorful and quirky rivals, including eccentric diva Kimari Tatsumi and arrogant prodigy Tegamaru Tanashi. Along this journey of self-discovery and card-gaming shenanigans, there are no ordinary days in the lives of young heroes striving to take the crown!

Fifteen years ago, Dark Schneider, a ruthless magician of immeasurable power, sought to conquer the world with an army led by his generals, the Four Divine Kings. However, he was defeated and sealed in the body of a newborn boy. In the present day, the disbanded party of Dark Schneider has reformed with a macabre goal: to resurrect Anthrasax—the god of destruction that nearly annihilated the world four centuries ago—and establish a war-free society. To do so, the Four Divine Kings must break four seals located in four different kingdoms. Targeted for its seal, the kingdom of Metallicana struggles to repel the army commanded by the Four Divine Kings. With hope dwindling, all eyes turn to the daughter of Metallicana's Grand Priest, Yoko Tia Noto. Not only is she aware that her adopted younger brother, Lucien Renlen, is Dark Schneider's prison of flesh, but she also knows the ritual to break the seal. Left with no other choice, Yoko successfully releases Dark Schneider, whose twisted personality has not changed over the years. As the fate of the world depends on where his allegiance lies, Yoko seems to be the only person who has some control over the powerful magician. But convincing Dark Schneider to turn against his old allies and protect those Yoko holds dear may prove to be an impossible feat.

​Sawako Machida—or Miss Bernard, as she prefers to be called—can frequently be found in the school library with a book in hand. Whether or not she has read it, however, is another matter entirely. In her own words, Sawako finds it too much work to actually read, and would rather just make others believe she spends a lot of time reading. But in the same library where she constantly hangs out, there are other students who love books and are quite upset with her disdainful approach to reading their favorite titles. As she pretends to read and discuss great literary works amid eccentric book lovers, Sawako finds herself learning something after all, as well as making new friends along the way.

In the Kingdom of Midland, a mercenary named Guts wanders the land, preferring a life of conflict over a life of peace. Despite the odds never being in his favor, he is an unstoppable force that overcomes every opponent, wielding a massive sword larger than himself. One day, Griffith, the mysterious leader of the mercenary group Band of the Hawk, witnesses the warrior's battle prowess and invites the wandering swordsman to join his squadron. Rejecting the offer, Guts challenges Griffith to a duel—and, much to the former's surprise, is subsequently defeated and forced to join. Now, Guts must fight alongside Griffith and his crew to help Midland defeat the Empire of Chuder. However, Griffith seems to harbor ulterior motives, desiring something much larger than just settling the war...