Mr. Osomatsu: Season 4
Season 4 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Mr. Osomatsu Season 3.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 4 Progress Shield
It's Starting Again
Jul 9, 2025
The sextuplets spend a lazy Tanabata with friends and neighbors.
Watermelon Alien
Jul 16, 2025
The sextuplets get a craving for watermelon, unbeknownst to an intergalactic invasion being underway.
Thunderstorms and Crew Cuts
Jul 23, 2025
A rainy day forces the sextuplets indoors, leading to a series of events involving Ichimatsu's bad new haircut.
Temple Festival
Jul 30, 2025
The sextuplets and their friends get ready for a mysterious temple festival.
Rest / Fishing Hermit
Aug 6, 2025
After the festival, the sextuplets get some rest to ease their injuries. / Two fishermen (Todomatsu and Karamatsu) meet a fishing hermit (Jyushimatsu).
Fans and Time Machines
Aug 13, 2025
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.
Storytime, Jo
Aug 20, 2025
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
Ichimatsu and the Thieving Cat
Aug 27, 2025
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.
The Idiot Series
Sep 3, 2025
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
Iyami and the Shy Little Aliens
Sep 10, 2025
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.
The Sextuplets Have the Same Dream
Sep 17, 2025
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
Sep 24, 2025
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 c
The Matsuno Ten
Jun 13, 2026
In a parody of 80s music show "The Best Ten", the cast perform retro-styled songs, themed to the sounds of the late Showa era's most popular musicians.