4th Season

The sextuplets spend a lazy Tanabata with friends and neighbors.

The sextuplets get a craving for watermelon, unbeknownst to an intergalactic invasion being underway.

A rainy day forces the sextuplets indoors, leading to a series of events involving Ichimatsu's bad new haircut.

The sextuplets and their friends get ready for a mysterious temple festival.

After the festival, the sextuplets get some rest to ease their injuries. / Two fishermen (Todomatsu and Karamatsu) meet a fishing hermit (Jyushimatsu).

After their fan breaks, the sextuplets set off on a time travel mission to recover the fan when it worked, with many failed retrievals made along the way.

Classic children's tales retold with an Osomatsu bent. A Dog of Flanders with many ludicrous variants of Nello and Patrache's deaths, Snow White has a mysterious power, Hansel and Gretel get diplomatic, and several cranes repay their debts to one very generous old man.

Ichimatsu tries to domesticate a stray cat known for its human-like thievery, but runs into trouble when his new buddy falls back into their old ways.

Television parodies featuring the Osomatsu cast. The older set does some calisthenics with disastrous results, Jyushipi and Choropi conjure up some magical cooking, the sextuplets and their parents involve themselves in a yakuza movie-style argument, a sextet of singing fungi try to escape their fate of harvesting, and the Idiot Brothers, Idiot Sisters, and Idiot Married Couple partake in a manzai sketch comedy bit.

After an influx of intergalactic immigrants take residence in Japan, Iyami opens up a maid cafe with some shy multiplying aliens as the main attraction.

Like how some twins can feel phantom pains, the sextuplets occasionally have the same dream. Here are two surreal dreams about bodily transformation that the brothers have.

The end of summer has arrived, with Chibita deciding to close up his oden stall and pursue a charitable cause. Osomatsu, frustrated with this sudden change, angrily pressures his childhood buddy to stay.