As the all-girl band Poppin’Party continues to rise in fame, they find a poster for an event at the legendary Nippon Budoukan. Now determined to participate in the BanG Dream, Kasumi Toyama and the other members of Poppin’Party aim to reach new heights and prove their worth by performing on that renowned stage. Meanwhile, rival band RAISE A SUILEN dreams of changing the world with the strongest music, but finds itself in dire straits without a guitarist. Though dozens of potential candidates audition for the role, band leader CHU² believes them to be amateurs and unsuitable for the band. However, there may be one guitarist that lives up to CHU²’s high standards. BanG Dream! 3rd Season features multiple all-girl bands, including Poppin’Party, Afterglow, Pastel*Palettes, Roselia, Hello Happy World!, and now RAISE A SUILEN, as they work to astound fans throughout Japan with their spectacular performances. As the BanG Dream competition draws near, the band members are prepared to captivate audiences with their heartfelt music!

Two special episodes featuring a violin rock band, Morfonica.

The Band of the Hawk and their enigmatic leader Griffith continue winning battle after battle as their prestige throughout the kingdom of Midland grows. But their latest task is one that has seen failure from everyone who has attempted it: the subjugation of the impenetrable fortress of Doldrey. But with members like Guts—the captain of the Hawks' raiders who can easily fell 100 men with his gigantic sword—such tasks prove to be trivial. However, in the aftermath of the battle, Guts decides to leave the Hawks in order to pursue his own dream and bids farewell to his companions, despite Griffith's attempts to make him stay. This single event causes Griffith to lose his composure, and leads him to make a decision that will alter his and the Hawks' fates forever.

Fleeing a traumatic childhood, lone mercenary Guts drifts from battle to battle, striking down powerful enemies with his unwieldy sword. After one skirmish, Guts clashes with the mystifying Griffith and his small army known as the Band of the Hawk. The victorious Griffith drafts Guts into his ranks, granting the swordsman a kinship unlike anything he has ever known. Alongside the skilled warrior Casca, Guts helps Griffith guide the band to fame and glory. But as he gains military prestige, Griffith becomes the target of assassination attempts and political schemes. He uses Guts to further his ambitious rise to power, taking advantage of the swordsman's lack of aspiration. Even as he grows closer to Casca, Guts' absence of direction robs him of any sense of belonging. Fostering opposing desires, Guts and Casca fight for Griffith's dream—although fractures forming among the trio threaten to disrupt their world.