The Matsuno brothers struggle to find employment. Later, Osomatsu tries to take an interest in his brothers' lives but winds up being a nuisance to them.

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.

The 10-year-old Matsuno sextuplets of Osomatsu-kun are given a glimpse of the future and see they're going to get fat, greedy and beaten up by angry girls.

Dayon uses Dekapan's latest invention to merge various people together into new beings, with a fiendish end goal in mind. Jyushimatsu becomes determined to get a job at a sea park as an actual dolphin, receiving strict training from a familiar female trainer. Meanwhile, Totoko and Nyaa encounter each other at Chibita's oden stand.