We are introduced to Kino, a junior high school student, as the story begins. The convergence of Seven Parallel Universes occurs every century, resulting in a week-long battle between various civilizations vying for control. Typically, a dominant force rules over these universes. However, the Ultra Beast Force Army, a group of elite fighters from each universe, stands in their way. This time, Mio, the supreme ruler of all universes, is close to seizing control. Kino and his team are among those selected to fight against her under the guidance of Master Wyatt. They undergo rigorous training, explore numerous multiverses, and encounter both allies and enemies in their mission to thwart Mio's plans. Kino possesses the potent "Dark Energy Locker," which allows him to transform into a Robo-Soldier using the dark energy within him. As they journey through the multiverses, they come across malevolent foes who seek to hinder their progress in achieving their ultimate goal.