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.

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.

Beiyi used a strategy to attack Baicheng, an important town in the northern border of Daqi Kingdom. Tang Yao, the guard of Baicheng, led his people to resist desperately, but they were outnumbered, and all sacrificed. Only the second daughter, Tang Ying, survived. What makes Tang Ying even more indignant is that his father sacrificed his life for the country, but in return he was charged with collaborating with the enemy. In order to take the place of her father, Tang Yingyi went to the capital, but found that things were not as simple as imagined. Is Yuan Lang, the second prince of the Daqi Kingdom who has been hostage for decades, related to Beiyi? Why is the woman pretending to be herself so strangely similar? What happened to the otherworldly person that Yao Niang from the movie department was talking about? There are also those strange and familiar memories that appeared nervously... There are too many mysteries waiting for Tang Ying to answer.

Yuuyu, Raika, and Touya were invited to America after their win in the "Deluxe" tournament in Japan. They went on a tour of exhibition matches. Danji, who had arrived earlier in America to look into the background of the Deluxe tournament at Michiru's behest, suspects a connection with the case of the missing fighters.