a big blue haired firefdighter boy

All Might and Deku accept an invitation to go abroad to a floating and mobile manmade city, called 'I-Island', where they research quirks as well as hero supplemental items at the special 'I-Expo' convention that is currently being held on the island. During that time, suddenly, despite an iron wall of security surrounding the island, the system is breached by a villain, and the only ones able to stop him are the students of Class 1-A.

In a society devastated by the effects of an all-out war between heroes and villains, a mysterious giant fortress suddenly appears, engulfing towns and people one after another. Then, a man reminiscent of All Might, the 'symbol of peace', stands in front of Izuku and his friends...

A young boy is saved by firemen in a fire. His name is Daigo Asahina. Now he's a grown-up and has recently received his credentials as a firefighter. He has wanted to become a firefighter like the hero who saved him…

He wanted to put out everything that smoulders, smokes or burns. Even the Sun! Until he flared up himself... from love.

He's a big red engine with a siren, a horn, a tank full of water, and a whole lotta hose! He's a good-lookin' fire truck — and he's brave, too — but when the alarm sounds, he's gotta drive through smoke and heat, straight to a blazing fire!