After Japan's Shogunate is occupied by an alien army, a samurai forced to work as a handyman forms a squad of swordsmen to fight back.

The red-light district, Yoshiwara, is suddenly taken over by "Aizen Kou," an incense that has the ability to make anyone fall in love with the first person they see. Having been outlawed for its strong potency, the love drug was thought to have disappeared from the red-light district for good; however, it seems to have found its way back inside Yoshiwara's walls and now has the entire district under its influence. Of those affected is the cold-hearted Hyakka captain, Tsukuyo, and the first person she sees after inhaling the smoke is none other than the brazen Yorozuya leader, Gintoki Sakata. Unbeknownst to everyone else though, she was already attracted to Gintoki. With those hidden feelings now intensified, Tsukuyo must overcome her afflictions and work with the Yorozuya to return everyone back to normal.

Remake of episodes 139-146 of Gintama, following the Yoshiwara in Flames arc.

A compilation film of the Thorny Arc, episodes 43–46 in the second season, featuring additional footage. The movie is a part of the "Gintama 20th Anniversary Project."