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As the battle between Sonic, Flashy Flash, and the Heavenly Ninja Party comes to an end, Flashy Flash unveils the dark origins of the Ninja Village. But just as the dust begins to settle, the remains of his fallen upperclassmen fuse together, forming a new entity—Empty Void—leaving both Flashy Flash and Sonic stunned.

The intense battle between Speed-o’-Sound Sonic, Flashy Flash, and the Heavenly Ninja Party rages on. In the end, Flashy Flash overcomes every one of his former upperclassmen from the Ninja Village.

Speed-o’-Sound Sonic and Flashy Flash begin their long-awaited battle, but it’s quickly cut short by the sudden arrival of the Heavenly Ninja Party. Confronted by their former upperclassmen, the two rivals join forces to face the greater threat.

Speed-o’-Sound Sonic and Flashy Flash clash in a fierce duel, but their fight is abruptly interrupted by the arrival of the Heavenly Ninja Party. Facing their powerful former upperclassmen, the two rivals put aside their differences and join forces.

Inside Hero Apartment 104, Flashy Flash shares the story of his and Speed-o’-Sound Sonic’s time at the Ninja Village, revealing that during his graduation exam, he eliminated every other candidate—leaving only Sonic alive.

The Heavenly Ninja Party sets their sights on world domination, plotting to assassinate both Flashy Flash and Blast. Meanwhile, at Hero Association HQ, Saitama, Flashy Flash, and Manako meet with Blast and Sitch—who now finally acknowledge the true extent of Saitama’s power.

Genos interrupts Saitama and Flashy Flash’s match. They encounter and defeat Internet Surfers, Speed-o’-Sound Sonic, Gale Wind, and Hellfire Flame. Later, Saitama, Flashy Flash, and Manako meet Blast at Hero Association HQ.

Saitama accidentally frees and defeats an ancient dragon, resolving a long-standing conflict. Flashy Flash arrives while Saitama is gaming with King, wanting Saitama to be his disciple and help find Manako. Saitama refuses, leading to a potential fight.