The Matsuno brothers try to adapt their show to contemporary times, with mixed results.

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

Captain Choromatsu invites an interesting detective onto an increasingly dangerous murder case to ease the tension of the crew. / Totoko wants to be a popular idol, but reality is so cruel.

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.