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.

The prehistoric sextuplets fool with nature for the last time. Several thousand years later, in a parody of Romance of the Three Kingdoms, Emperor Osomatsu and a group of bizarre generals attempt to take over the country. Meanwhile, in the real world, Osomatsu joins Todomatsu at a mixer, struggling to keep his perverted instincts in check.

A series of end-of-year skits. Osomatsu and Choromatsu try to do one thing that could make them say they had a good year. Ichimatsu gets persuaded to take part in a lottery, Dekapan and Dayon pound mochi together, Hatabou gets pestered by some greedy Jizou statues, and Choromatsu sends some untruthful New Years' cards. During the second half, a news crew documents Todomatsu, who was let go from the Matsuno family the previous year and is forced to try out for a reserve team.

In the 1960s, Iyami comes across a blind flower girl named Okiku and, despite being poor himself, tries to help her raise money for eye surgery.

Matsuzou becomes hospitalized, leading the brothers to seriously think about their lives and get proper jobs to support their family. A chance meeting with Totoko sets Osomatsu's mind straight...