The catastrophe we all knew was coming has finally happened.
Academy City’s #3 – Railgun Misaka Mikoto.
Academy City’s #5 – Mental Out Shokuhou Misaki.
Those special girls stand at the peak of prestigious Tokiwadai Middle School.

In a way, this confrontation may have been inevitable. This is a true direct clash between Level 5s, where rules, manners, morals, and taboos are meaningless. They will settle this once and for all, even if it means destroying the world as we know it.

Both Level 5s will draw on their full specs with no concern for what happens to anyone else.

When the #3 and the #5 wield their full power against each other with no restraint or mercy, who will ultimately win?

Note: Includes 1 prologue and 1 epilogue