My Hero Academia Codex

Joint Training Arc

Rivals unite for a battlefield clash that redefines heroism and shatters complacency.

The Joint Training Arc shatters U.A.'s bubble of complacency, forcing the celebrated Class 1-A into a brutal reality check against their long-ignored rivals: Class 1-B. Far from a mere exhibition match, this curriculum shift pits two distinct philosophies against one another in high-stakes five-on-five brawls. Where Class 1-A relies on individual star power and instinct, Class 1-B counters with ruthless coordination and strategies honed in the shadows. The arc strips away heroics' glamour, revealing that true strength lies not in how loud a Quirk roars, but in how silently a team moves to dismantle an opponent's entire game plan.

Arc Position
Follows the Shie Hassaikai Arc; precedes the Meta Liberation Army Arc
Primary Participants
Class 1-A and Class 1-B Students
Key Organizers
Shota Aizawa (Eraser Head) and Neito Monoma
Battle Format
5-on-5 Team Battles with specific rules and time limits
Outcome Significance
Establishes mutual respect between classes; reveals hidden strengths in 1-B

Lore & Background

Following the chaotic events at the Shie Hassaikai, U.A. High sought to prevent Class 1-A from becoming arrogant after their recent success against villains. To address this, teachers arranged a joint training session with Class 1-B, a group often overshadowed by their more famous counterparts despite possessing formidable abilities and tight-knit cohesion. The rivalry was sparked by Neito Monoma, who felt his class had been ignored for too long, leading to an intense desire to prove their superiority through combat.

The battles were structured to test not just raw power but strategic depth. Each team faced opponents with Quirks that could counter or neutralize their own strengths, forcing students to think on their feet rather than rely on brute force. This arc serves as a crucial narrative bridge, moving the story away from individual heroics toward the complex realities of coordinated team operations required in the professional hero world.

In Their Own Story

The training ground didn't just buzz; it crackled with the electric tension of suppressed rivalry. At the center stood Neito Monoma, his grin a jagged promise that Class B was done playing second fiddle. Across the field, Izuku Midoriya adjusted his gloves, his gaze darting over 1-B's faces—no longer strangers, but tactical puzzles he had yet to solve. The whistle cut through the air like a blade. In an instant, the quiet field erupted: Tetsutetsu's steel skin clashed against Kaminari's discharge, gravity warped under Shiozaki's vines, and ice surged from Juzo's hands. It wasn't just fighting; it was a chaotic symphony of clashing Quirks where Aizawa watched from the stands with arms crossed, knowing this was the only lesson that would stick: the world doesn't wait for heroes to be ready.

Reader's Guide

The arc ignites when Neito Monoma goads Class 1-A into accepting a challenge orchestrated by Shota Aizawa. The event unfolds across three grueling rounds of five-on-five battles, each engineered to expose specific tactical blind spots.

Round One forces random pairings between the two classes, stripping students of their usual comfort zones and demanding instant adaptability against unknown Quirks. This chaos highlights the danger of relying solely on established chemistry. Notable clashes include Denki Kaminari and Hanta Sero struggling to synchronize their timing against a coordinated 1-B assault, while Izuku Midoriya finds his usual analytical approach tested by opponents who refuse to play by the rules he expects.

Did You Know?

More in Story & Timeline

Open in the interactive codex →