Naoya Inoue and Stephen Fulton are ready to rumble.

During the official weigh in on Monday in Tokyo, Inoue stepped in at 121.9 lbs while Fulton came in at 121.7 lbs as they rev up for a war that is not expected to be a full 12 rounds Tuesday at the Ariake Coliseum.

Fulton's World Boxing Council and World Boxing Organization super-bantamweight crowns will be at stake.

Oddsmakers have installed Inoue, nicknamed "Monster" as the overwhelming favorite to snatch the two belts and position himself for a showdown for the undisputed showdown with Marlon Tapales in early-December.

Tapales, holder of the World Boxing Association and International Boxing Federation straps, has arrived in Tokyo to watch the fight at ringside.

Joining him there is MP Promotions chief Sean Gibbons and Filipino promoter JC Mananquil.