Mr. Osomatsu 4th season

Mr. Osomatsu returns for its fourth season with the beloved sextuplets now in their twenties, still navigating unemployment and the single life with their signature brand of chaos. This comedy series blends sci-fi and slice-of-life elements as the brothers stumble through new adventures, friendships, and situations that test their nonexistent limits. The fourth season consists of 13 episodes and began airing in summer 2025.

The series finished airing its initial run, though its final episode faced production delays. After airing a special episode 12.5 in place of the season finale, the team announced that episode 13 was still in development. The actual concluding episode eventually premiered as part of the franchise's 10th anniversary celebration in 2026, receiving a limited theatrical screening before its official broadcast release.

Fans of the Osomatsu franchise will recognize the irreverent humor and character dynamics that define the series, while newcomers can jump in expecting absurdist comedy centered on six identical brothers whose incompetence is matched only by their charm. The show maintains the comedic energy the franchise is known for while exploring new angles on these characters as they continue their aimless adult lives.