Mr. Osomatsu: Season 4, Episode 12 - The End of Summer (2025)

The end of summer arrives in Akatsuka Ward. The Matsuno sextuplets--Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, and Todomatsu--lounge around their home, bored and sweaty from the lingering heat, discussing idle plans like buying a bike or gambling since they have nothing better to do.

Chibita gathers the sextuplets at his oden stand, sweating profusely himself, and reveals his new goal: to buy a motorcycle now that summer is ending, using the money from his summer sales to upgrade from his old bike and impress everyone with speed and style.

The sextuplets mock Chibita's ambition, betting he won't succeed, but Osomatsu suggests they pool their nonexistent money to help, leading to a chaotic group decision to hustle for cash through shady schemes like street performances and begging.

Chibita rejects their half-hearted offers, insisting on doing it legitimately, and challenges them to a race: if he wins his new bike legally, they owe him oden for life; if not, he'll serve them free forever. The sextuplets accept, driven by greed for free food.

Jyushimatsu finds a stray cat and brings it home, naming it "Maro," while the brothers argue over how to exploit it for Chibita's bike fund, with Ichimatsu quietly bonding with the cat out of his usual loneliness.

Osomatsu accidentally injects the cat with a mysterious serum from a junkyard vial, causing Maro to gain the ability to speak human language and read minds, shocking the household as it meows insults and reveals hidden thoughts.

Maro reads Ichimatsu's mind first, exposing his deep self-loathing and secret affection for the cat, making Ichimatsu blush and lash out in embarrassment, deciding to abandon Maro to hide his vulnerability.

The sextuplets chase Maro through the streets to recapture it for a sideshow act to earn bike money, but Maro dodges them by revealing embarrassing mind-reads: Osomatsu's laziness, Karamatsu's cringy poses, Choromatsu's otaku obsessions, Jyushimatsu's mania, and Todomatsu's scheming.

Chibita spots the chaos and captures Maro himself, using it as leverage to demand the brothers pay their massive oden tab immediately, tying Maro up at his stand as hostage.

Karamatsu volunteers to infiltrate Chibita's stand at night in a ninja disguise, deciding heroically to free Maro single-handedly to prove his worth to his brothers.

Karamatsu sneaks in but trips alarms, leading Chibita to wake and confront him; Karamatsu confesses the tab debt but boasts he doesn't care about rescue, shifting his decision to negotiate by offering labor instead.

Chibita reveals he read Maro's mind too, learning the brothers' true apathy toward Karamatsu, crushing him emotionally; Karamatsu slumps in defeat, deciding to accept his worthlessness.

The other sextuplets arrive at dawn, not to save Karamatsu but to eat free oden while he's hostage, laughing off the situation; Chibita fumes and releases everyone, deciding his bike dream is more important than revenge.

Maro, now feral from the serum wearing off, scratches everyone and runs away, with Ichimatsu quietly deciding to let it go free, hiding his sadness.

Chibita unveils his new motorcycle, bought with summer profits, revving it triumphantly as the sextuplets concede the bet, sulking while he speeds off, ending summer on his high note.

As summer draws to a close, Chibita announces his decision to leave the house and start a new life elsewhere, shocking his friends who initially resist but ultimately accept it with a mix of reluctance and camaraderie, ending on a bittersweet note of farewell among the brothers and their circle as they prepare for the changes ahead.

Now, let me take you through the ending of "The End of Summer" from Mr. Osomatsu 4th Season Episode 12, unfolding it scene by scene in the raw rhythm of the story, painting every moment with the vivid pulse of their world--the sweat of late summer air, the weight of unspoken bonds, the flickers of hesitation in eyes that have shared too many lazy days.

The scene opens in the dim glow of the Matsuno house as evening deepens, the brothers--Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, and Todomatsu--lounging in disarray around a low table littered with empty snack wrappers and half-drunk sodas, the humid stickiness of fading summer clinging to their shirts. Chibita stands at the center, his small frame tense, fists clenched at his sides, face flushed with a determination that's been brewing unseen. "Chibita has decided," he declares firmly, voice cutting through the murmurs. "You don't have to worry about it. I want to keep the house--no, I don't understand that! Everyone has decided that! Chibita has always thought about it. Why are you? Chibita. We're not going to keep the house. I'll stop. I've had to start a new life." His words tumble out raw, eyes darting between the sextuplets, Iyami slouched in the corner with his usual smug grin cracking slightly, the air thick with the scent of oden pots cooling nearby from an earlier meal.

The brothers react in waves--Osomatsu bolts upright first, spilling his drink, yelling "What?" in disbelief, his lazy slouch gone as confusion twists his features. Karamatsu strikes a dramatic pose, hand to his heart, murmuring "Chibita..." with feigned sorrow that doesn't hide his wide-eyed shock. Choromatsu pushes up his glasses, stammering "What? That's crazy, Chibita. Is that what I'm gonna do?" his analytical mind scrambling for logic in the sudden shift. Ichimatsu stays half-hidden behind a cushion, muttering low "You're right. You're right," but his narrowed eyes betray unease. Jyushimatsu laughs wildly at first, then quiets, tilting his head with a rare stillness. Todomatsu gasps theatrically, phone forgotten in his lap, "What? Tomorrow?" The group erupts into overlapping shouts--"What? What? What is that?"--their voices piling like a chaotic chorus, bodies leaning in, the room shrinking under the weight of this fracture in their endless summer routine.

Cut to the next beat outside under a starless sky, the group huddled on the engawa, cicadas silent now as night cools the air. Chibita nods resolutely, backpack slung over one shoulder, stuffed with his curry shop apron and a few crumpled yen notes. "Tomorrow. You're going to be in the world now!" he says, forcing a grin that wavers, sweat beading on his forehead not just from heat. The brothers circle him loosely, Osomatsu clapping his back too hard, Karamatsu offering a flashy thumbs-up, Choromatsu adjusting his glasses again while mumbling agreements, Ichimatsu kicking at a pebble silently, Jyushimatsu waving jazz hands to lighten the mood, Todomatsu snapping a quick photo with teary eyes. Iyami lingers at the edge, arms crossed, muttering "Yeah, you're doing it right," his baragaki bravado masking a flicker of loss.

The tension peaks in a final huddle back inside, preparations frantic--bags zipped, a last round of snacks passed hand to hand. "We have to prepare! Yeah!" Osomatsu rallies, but his voice cracks. "Today's day is going to be over again," Chibita reflects softly, staring at the cluttered room that's held their brawls and feasts. "I've been missing something. Maybe tomorrow is going to be like this. But we'll meet each other." He counts them out--one, two, three, four, five, six--pointing at the Matsuno brothers, then himself as the seventh in spirit. "We're no one of our brothers," he finishes, the words a clumsy vow, eyes glistening as hugs are exchanged awkwardly, shoulders bumping, laughter forced through sniffles.

Fade to dawn breaking over the neighborhood, Chibita walking away down the empty street, his figure small against the rising sun, backpack bouncing lightly. The brothers watch from the doorway, waving until he's a dot--Osomatsu yawning but smiling faintly, Karamatsu posing heroically one last time, Choromatsu sighing with reluctant pride, Ichimatsu turning away first to hide his face, Jyushimatsu jumping in place, Todomatsu blowing kisses. Iyami trails a bit behind Chibita initially, then peels off with a nod. The screen lingers on the house, summer's end marked by this departure, the brothers shuffling back inside to their familiar chaos, but with an empty space at the table.

In this close, each main character's fate settles plainly: Chibita departs the house and their shared life, stepping into a new existence alone with his backpack and resolve, last seen vanishing down the road. Osomatsu returns to leading the sextuplets' idle days, waving goodbye with his usual energy masking deeper change. Karamatsu strikes his final pose, resuming his flamboyant pursuits at home. Choromatsu adjusts to the shift analytically, heading back inside pensively. Ichimatsu withdraws into silence, retreating first from the scene. Jyushimatsu keeps his manic energy, jumping as the group disperses indoors. Todomatsu captures the moment digitally, then follows the others home tearfully. Iyami parts ways quietly, his presence fading with Chibita's exit.

Yes, "Mr. Osomatsu" 4th Season episode 12 "The End of Summer" (2025) features a post-credits scene.

The episode's main runtime concludes around the 21-22 minute mark with the Matsuno brothers--Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, and Todomatsu--gathered in a nostalgic, bittersweet huddle under a fading summer sky, their faces flushed with sweat and reluctant smiles as cicadas hum faintly in the background. Osomatsu, ever the impulsive leader, pumps his fist with forced cheer, his messy hair sticking to his forehead, while inwardly grappling with the sharp pang of summer's end and the brothers' inevitable drift apart. Karamatsu strikes a dramatic pose, sunglasses slipping down his nose, masking his quiet dread of loneliness with exaggerated flair. Choromatsu adjusts his glasses nervously, his analytical mind racing through memories of failed schemes, a lump in his throat betraying his tsundere affection. Ichimatsu slouches in shadow, cats circling his feet, his deadpan expression hiding a rare flicker of attachment to this chaotic family bond. Jyushimatsu bounces erratically, bells jingling, his manic grin barely concealing the void of routine's return. Todomatsu pouts cutely, phone in hand, feeling the superficial sting of lost vacation vibes amid his craving for attention.

As the screen fades to black after their chant--"One, two, three, four, five, six, we're none of our brothers"--the post-credits scene kicks in immediately, extending about 20 seconds. The brothers scatter into everyday monotony: Osomatsu sprawls on the floor nursing a hangover, mumbling regrets; Chibita bursts in from off-screen, yelling about unpaid tabs with veins bulging on his forehead, his tiny frame trembling with explosive frustration born from years of brotherly exploitation. The camera lingers on their exhausted faces, capturing the raw emotional whiplash from summer's fleeting joy to harsh reality, underscored by a melancholic piano sting that evokes quiet resolve to endure another aimless cycle together.

In Mr. Osomatsu season 4 episode 12 'The End of Summer', as summer concludes, Chibita announces a bold new ambition tied to his oden business, surprising the Matsuno brothers with its unexpected scale and determination, reflecting his persistent drive amid the changing season.

The sextuplets display their typical chaotic indifference and mockery when Chibita shares his goal, with Osomatsu laughing uproariously, Karamatsu striking a dramatic pose in false support, and Ichimatsu muttering cynical remarks, heightening the comedic tension of the summer's end.

The family's pet cat, previously injected with a mind-reading serum, makes a cameo in this episode, briefly revealing Ichimatsu's hidden resentment towards his brothers during the end-of-summer gathering, amplifying his isolated emotional turmoil.

Totoko attempts to capitalize on the season's close by organizing a failed beach outing with the brothers, her frustration boiling over into physical comedy as she chases them, underscoring her unrequited crush and desperation for attention.

Iyami crashes the scene with his signature 'seyyy' antics, attempting to hijack Chibita's announcement for his own schemes, leading to a slapstick confrontation that derails the moment and emphasizes Iyami's disruptive, self-serving nature.

No, this episode is not family-friendly due to its mature content rating.

Potentially objectionable or upsetting aspects for children or sensitive viewers include: - Violence, such as explosive accidents or physical harm in comedic scenarios. - Nudity, including brief or implied exposures. - Offensive language, with profanity and crude dialogue. - Sexual references, involving suggestive humor or innuendo.