Crayon Shin-chan Gaiden: Kazokuzure Ookami

In a feudal world ruled by ridiculous schools of swordsmanship, master butt-swordsman Hiroshinosuke Nohara wanders with his family in search of work. Their journey gains new companions when they meet the mysterious Hazumi and a wild dog named Shiro, but it also attracts assassins eager to cut the family's travels short.

The greatest threat comes from the Demon Bull Clan and its fearsome armpit-swordsmen, sworn enemies of Hiroshinosuke's style. Father and son are forced to put their unconventional techniques to work against an increasingly bizarre procession of attackers, turning a wandering-samurai tale into a battle over whether butts or armpits possess the superior art.