A banned love incense called Aizen Kou resurfaces in the Yoshiwara red-light district, forcing anyone who breathes it to fall for the first person they see. When Hyakka captain Tsukuyo inhales the smoke, the first face she lands on is that of Yorozuya leader Gintoki Sakata. A bungled attempt to round up the incense floods the whole district, dragging the Yorozuya and several regulars into the chaos. This two-part OVA shipped with limited editions of the Gintama manga rather than airing inside the Gintama° television run.