The big weapon that Kambei and the group found belongs to Tanomo when he gets destroyed by the capital's cannon in the last episode.
Durian is a real fruit and it does smell quite noxious. However, it does not grow "anywhere" (it is a tropical rainforest plant). It also cannot be found in deserts and does not grow on Malaysian in orgin.
Komachi: (About the weapon they found) What is it?
Kikuchiyo: Hip of junk, apparently.
Shichiroji: He's probably right. It's no good.
Kambei: I'm not sure. (Shichiroji, Heihachi, and Kyuzo are surprise that Kambei finds the weapon that KIkuchiyo found can be useful)
Ukyo (about the Nobuseri): They're so cute when they're domesticated.
Original Japanese Title: 契る! - Chigiru! (Promise!)
Original Japanese Airdate: December 11, 2004