The day before the ceremony marking the completion of the Yajima Stadium, Nils Nielsen invites Sei Iori, Meijin Kawaguchi, and others to an exhibition battle using the new large-scale battle system he has designed. Now that they are all reunited, Sei attempts to show off the Build Strike Cosmos that he has upgraded for the exhibition, but then he notices something missing... Meanwhile, somebody takes control of the stadium's systems, sealing Sei and the others inside. Before them appears a mysterious group, which has come to challenge them to Gunpla Battle.

Distribution via Internet in China starts in August 2020. The Japanese broadcast on Tokyo MX started on October 2, 2020.

Shen Jianxin is a security guard for Rye Scent Village, an average youth determined to become a legendary hero. While paying his respects at the prestigious Pure Yang Palace of Jianghu, he learned the palace’s ancestral secret manuals by accident. However, he was unaware of the power he gained. Thus, he entered Jianghu and gradually matured while experiencing the turmoil of Jianghu during the prosperous Tang Dynasty. An obscure security guard with unparalleled martial arts in Jianghu: who knows what storms are ahead?

Facing the threat of the Qin State, danger seems to lurk within the Han State, which is known as the weakest out of the Seven States. Unknown to the Han Emperor, that very threat is the Great General of Han, Ji Wuye. Working under the Great General are the Four Fearful Warriors of Nightfall. Each four specialized in military, finance, politics, and espionage. In hopes of creating a new Han State, Quicksand was formed by Han Fei, the ninth prince of the Han. With Wei Zhuang, Zhang Liang, Zinü, and Nong Yu, they support the Prince in realizing the goal of Quicksand while being drawn into a whirlpool of power named “world”.