Todomatsu starts to work at a stylish cafe. His brothers try to disturb his fulfilling life. / Dekapan and Dayon enjoy a carefree travel together toward north.

The brothers all catch colds. Later, the brothers question Todomatsu about all the things he hasn't told them about his personal life. Choromatsu is a paranoid vice-principal overly worried about plans for his school's cultural festival.

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.