Insects were appearing in large numbers and behaving abnormally in many parts of the world. They were on alert, sensing a crisis coming to Earth. Takuya Kai and his friends put on the Insect Armor developed by Dr. Mukai and fight the invaders from another dimension, Jamal, as B-Fighters.

The invader, Jamal, has devised a terrifying human conversion plan. The B-FIghters are helpless in the face of the brainwashed people. The time limit for the invasion of Earth is approaching. Can the B-Fighter's desperate infiltration mission destroy Jamal's frontline base?