When a mysterious space-time disturbance tears through U.A. during a routine training exercise, Class 1-A, several Pro Heroes, and their teacher, Aizawa, are thrown into a world unlike anything they've ever imagined—a world where villages are hidden in forests, children train to become shinobi instead of heroes, and chakra flows through every living thing.

Separated from everything they know, the heroes-in-training find themselves in the Hidden Leaf Village, where their arrival immediately raises suspicion. Their strange abilities resemble neither ninjutsu nor kekkei genkai, and their claims of coming from another world sound too unbelievable to ignore.

Now caught between two vastly different societies, U.A.'s students must learn to navigate shinobi customs, dangerous missions, political tensions between villages, and threats that could endanger both worlds. Along the way, they'll meet Naruto Uzumaki and his friends, discover the differences between Quirks and chakra, and uncover the truth behind the mysterious force that merged their realities.

Can two generations of heroes—one born from Quirks and the other from the Will of Fire—work together before the worlds collapse?