Riding Bean (ライディング・ビーン, Riding Bean?) is an anime original video animation following the exploits of courier-for-hire Bean Bandit and his partner and gun(wo)man Rally Vincent.

There was also a manga published in the Japanese magazine Monthly Comic Noizy (月刊コミックノイズィ, Gekkan Komikku Noizui?) that was left unfinished (due to the cancellation of the magazine) after its fourth chapter. The manga is included in the final volume of the Revised Edition of the Gunsmith Cats manga.

Source: Wikipedia