Ryouta Satou, who died from overworking at a black company, was reincarnated to another world. Although Ryouta was alive, he was now burdened with the inconvenience that his level is fixed to 1 in this new world. Although he wasn’t able to raise his level, he had a unique skill that can create a cheat-like item that shouldn't exist in the world from monsters. Knowing this, he maxed out his stats with the help of ability-up items, and he gathered a number of weapons and items that can only be used by himself, which made him have the strongest stats and gear despite being level 1.

This ambitious series will focus on Miyamoto Musashi, who is modeled after Toshiro Mifune, the Japanese film icon known around the globe. This is the beginning of an intense series full of realistic action in which Musashi's blade slices through evil as he traverses a land plagued by poverty.

After their world was saved by Gridman and Akane Shinjo returned to the real world, Yūta, Rikka, and Utsumi return to their normal lives, though Yūta still has to adjust to losing two months of his memories due to being possessed by Gridman during that time. Rikka and Utsumi work on writing a script for a play their class will perform in the upcoming school festival based on their experiences with Gridman, while Yūta tries to work up the courage to confess his feelings to Rikka. However, their life is disrupted when a kaiju suddenly attacks the city. Yūta voluntarily fuses with Gridman again to fight the kaiju, and is assisted by the return of the Neon Genesis Junior High Students, who now count a newly revived Gauma who commands DynaRex as their newest member. Gridman and the NGJHS defeat the kaiju, and explain that some unknown phenomenon is causing different universes to overlap in a potential Big Crunch.

After the end of the Hokuriku front, a new land for the Japanese people was created, governed by the New Japan Cooperation Organization. However, this did not dramatically improve the situation in Japan. The effective control of the various powers in the country continued, and the oppression of the Japanese people, though lessened, continued. The same is true of the isolated islands in the South Sea. The Oceania Army, which is in effective control of the island, and the resistance organization "Hinukan" that resists them. Then the North American forces attacks, aiming to take over the isolated island--.