The story follows Johnny, a teenager who is given a second chance at life when the spiral entity merges with him after his untimely death. Johnny is transported into the world of My Hero Academia with the spiral's help, where he aims to become a great hero.

However, unbeknownst to Johnny, there is a sinister force also at play - the anti-Spiral, born from the darkness in the void where Johnny was reborn. The anti-Spiral is the antithesis to the noble spiral entity, seeking only destruction and chaos. It too escapes the void, determined to oppose Johnny and the potential for good that he represents.

As Johnny trains to master his emerging spiral powers under his grandfather's guidance, the anti-Spiral secretly remains in the shadows, its evil growing. While Johnny attends UA High School and experiences the adventures of that world, the anti-Spiral plots to undermine him, waiting for the right moment to strike.

The anti-Spiral's malevolent influence is felt as it works to spread mayhem through cunning schemes and by empowering villains. Johnny experiences several run-ins with the anti-Spiral's pawns, though he remains unaware of the true puppet master behind it all.

The story builds towards an epic confrontation between Johnny and the fully manifested anti-Spiral. Only by unlocking the ultimate form of his spiral power can Johnny hope to stand against this ultimate evil. Their battle will determine not just Johnny's fate, but the fate of the Multiverse itself.

Throughout his journey, Johnny also wrestles with living up to his family legacy and discovering the kind of hero he wants to become. But he must rise to the challenge and realize his full potential if there is to be any hope of overcoming the anti-Spiral's apocalyptic designs. The stakes could not be higher, with two opposing cosmic forces battling to shape reality according to their will.