Gintama: Love Incense Arc (2016)

The red-light district of Yoshiwara is suddenly gripped by "Aizen Kou," a potent incense that compels anyone who inhales it to fall instantly in love with the first person they see. This love drug, thought to be eradicated from Yoshiwara, has reappeared, affecting the entire district. Among those affected is Tsukuyo, the detached captain of the Hyakka, who finds herself irresistibly drawn to Gintoki Sakata, the leader of the Yorozuya. Unbeknownst to everyone, Tsukuyo already harbored feelings for Gintoki. Now, with these emotions amplified, she must confront her own feelings and team up with the Yorozuya to reverse the incense's effects and restore normalcy.