The Matsunos are invited to Hatabou's birthday part. / Iyami discovers that his buckteeth contain a rare metal.

A salaryman named Sanematsu takes care of his six siblings, the Matsuno brothers play the roles of a friend group of working girls, and Choromatsu gets caught during a private moment.

Wanting to become the main protagonist of the franchise again, Iyami holds a bizarre kart race to determine who the protagonist of Osomatsu-san will be.

Iyami mooches off the sextuplets after falling on hard times and Hatabou searches for a friend.

Already angered over the sextuplets refusing to paying off their oden tab, Chibita vows revenge on them after they pluck out his one-and-only hair. That night, Chibita begins taking out the siblings on by one, shaving all of their hair and stuffing oden in their bodies.

Jyushimatsu befriends a young boy named Eitarou but gets called in by Eitarou's mother when he starts imitating him. Later, Dayon steals Dekapan's underwear, forcing him to give chase all over the city and universe while butt naked.

A group of aliens pursue the legendary space pirate, Shazarr. Later, displeased with Chibita's oden, Matsuzou serves up his own brand of the dish. Finally, the sextuplets become enamored by their new neighbor, Kinko Inuyama, prompting jealousy from Totoko when they go on a date with Kinko instead of her.

The Matsunos get drunk at the izakaya again. Dayon meets his doppelgänger. Iyami attempts suicide. The Matsunos get drunk at the izakaya one last time, but things turn introspective.