One year after the first season, the Brave Encampment is in chaos. Forced to inherit the title of Brave, Dragon Brave allies with her superior, Sword Brave, to hunt down a fleeing traitor. Distrusting each other, the two fight side by side in ancient ruins, only to fall into an enemy trap at the altar of the Demon God.

Morewant attempts to lead the demons against the Braves, disappointing the pacifist Fire Demon, who leaves. He sets out on a journey to find his true self. Along the way, he encounters the newly awakened demon king, "The Fallen Mad Demon." Reunited after a long separation, the two embark on a road trip, only to face a conflict over the decision of "fight or not."

The Fallen Mad Demon leads his army in a surprise attack on the Brave Kingdom, plunging humanity's "Peace Train" into flames. Faced with this crisis, the Guild Master, Sorry Brave, retreats. Dragon Brave and Sword Brave step forward, joining forces with Chief Brave and others to launch a thrilling counterattack aboard the speeding train.

As the brave forces are steadily losing ground, the demon people are drawn into the conflict by the radical tactics of the corrupted mad demon, forcing Morewant, who firmly believes in fairness, to struggle. At this time, the noble and sharp-witted psychologist Blood King appears, helping the Demon King to clarify his beliefs and responsibilities, embarking on a path of self-discovery and leadership.

Morewant's spell awakens a demonic freak in the magic academy. He discovers he's merely a test subject for the academy's vice-president, the Black Sword Magic, and is trapped in a dream conjured by the Librarian Witch. To embrace freedom, does the freak have the courage to escape the dream, step into reality, and save his future?

As the Demon Clan's election day approaches, the two opposing factions are set to compete in a flying competition at a spring banquet. The pro-war Lady Boss fights for revenge, while the anti-war Dragon Slayer advocates for peace. What began as a tense confrontation unexpectedly becomes a moment of mutual understanding—it turns out that the Demon Clan can also be a family.