Megaton Musashi X is set on Earth in the year 2118. The main characters pilot giant machines called “Musashi” to combat the Dorakuta, invaders from outer space that destroyed the planet in a matter of days.

This game was originally called Megaton Musashi and released on November 11th 2021 in Japan. They later decided to go free-to-play and re-branded the game as Megaton Musashi X.