Однажды в кино (2021)

Katsura, his faction and the Yorozuya are in Akiba hiding from the bakufu before encountering Nobume, Matoko and Takechi.Thus weaves a tale of the Kiheitai's fall, the Tendoushuu's birth and a surprising secret of Shouyou.

As the Yorozuya struggle with the recent revelations, the Kiheitai find themselves with unexpected allies. Now all will go on a journey to the planet Rakuyou, once the birthplace of two certain redhead Yato.

Enemies and allies have gathered on Rakuyou. So now the battles begin!

Katsura, Sakamoto, and Gintoki must face off against the most dangerous members of the Harusame, the 3 Mad Stars. First up, it is Katsura vs Shoukaku, along with the reveal of Katsura's past.

One Star down, two to go; next up, it is Sakamoto vs Hankai. As he struggles to save ship and crew from the android's machinations, a certain character gains development.

Two down, one to go; last up, Gintoki vs. Batou with mistaken identities and illusions galore. And in the end, a certain character awakens and a certain quartet reunite.

The Heavenly Kings are reunited to fight against the Harusame and Utsuro. Meanwhile, a certain father and son also reunite to kill the other; but not if Kagura have anything to say about it.

Umibouzu vs. Utsuro and Kagura vs. Kamui. Though along the way, the father and son reveal the figure who has a connection to all four of them, the deceased wife and mother of three of them, Kouka.

Through confusion and suffering, everything falls apart when Kouka grows ill and the ramifications of her constitution becomes apparent. In the present, Utsuro and Umibouzu's plus the siblings' fights end.

It is the Yorozuya and Abuto vs Kamui to save him from the brink.

The arc comes to a close. Takasugi vs Oboro and Oboro's past is revealed.

Utsuro's past is revealed as well as his ultimate plan, plus revelations are made. The Rakuyou Arc finale.