The story of Butt Detective the Movie: Star and Moon
Butt Detective the Movie: Star and Moon opens when a koala asks our unlikely hero to investigate a missing relative who vanished during an idol contest. What sounds like a straightforward case quickly spirals into something far stranger. The detective's investigation pulls him to Stardust Island—the glamorous home of the very contest where the disappearance occurred, but also the hidden headquarters of Phantom Thief Academy, a shadowy international criminal organization run by the mysterious Phantom Thief G. Rather than blow his cover, Butt Detective goes undercover as an idol contestant himself, which is exactly as absurd as it sounds. Running parallel to his investigation is a theft plot involving Phantom Thief U, a rival crook determined to steal back a valuable artifact called the Moonlight Stone from Phantom Thief G's clutches. The film weaves these threads together while also peeling back layers of Brown's past—a reveal that gives the whole adventure unexpected emotional weight.
What makes this premise work—and here's where the film's DNA becomes clear—is that it doesn't treat any of this as too serious. The central joke, the absurdity of a detective shaped like a rear end infiltrating an idol competition, is the foundation, but the script doesn't just coast on that gag. Instead, it builds a genuine mystery underneath, one that requires actual detective work and genuine stakes. Stardust Island becomes a character itself: a place where glamour masks danger, where the idol industry's bright facade hides shadowy dealings. The 77-minute runtime keeps the pacing tight, moving from one discovery to the next without ever feeling rushed.
Behind the making of Butt Detective the Movie: Star and Moon
Butt Detective the Movie: Star and Moon is produced by Toei Animation, the legendary studio behind Dragon Ball, Sailor Moon, and One Piece—a pedigree that means the film benefits from decades of animation expertise and franchise-building know-how. This isn't the franchise's first rodeo; Butt Detective (おしりたんてい) is an established series with a devoted fanbase, particularly in Japan, where the character has already proven his staying power across multiple media formats. The decision to bring the character to the big screen with a feature film speaks to the IP's commercial viability and audience affection.
Toei Animation's involvement guarantees a certain baseline of production quality—clean character design, fluid action sequences, and the kind of background detail that separates theatrical animation from straight-to-streaming work. The studio's experience with ensemble casts and comedic timing shines through in how the film juggles its multiple plot threads without losing focus. While specific box-office figures and awards recognition for this particular 2025 release are still emerging, the film's IMDb rating of 7.5/10 suggests it's connecting with viewers who've seen it. For families and animation enthusiasts tracking new releases, Movie OTT provides real-time updates on where this title lands across streaming platforms as availability shifts.
The voice cast—though not universally recognizable to Western audiences—includes performers experienced in anime and comedy timing, which matters enormously in a film that relies on rapid-fire jokes and character-driven humor. Toei's track record with family-friendly content means the studio knows how to pitch comedy to both children and adults without talking down to either group.
What makes Butt Detective the Movie: Star and Moon stand out
Here's what's striking about this film: it could've been a one-joke premise stretched to feature length, but it isn't. The character design—a detective who is, literally, a butt—could feel cheap or one-note, yet the film treats him as a genuine investigator with actual detective skills and emotional depth. That's harder to pull off than it sounds. What I keep coming back to is how the film manages tone. It's silly without being stupid, comedic without being mean-spirited, and it earns its emotional beats through character work rather than just shock value.
The mystery plot itself functions as a real mystery. Viewers aren't just watching a character move from setpiece to setpiece; they're following clues, making connections, and arriving at reveals that feel earned. The Moonlight Stone subplot, running alongside the main investigation, creates genuine tension—you're never quite sure whose side characters are on, whether Phantom Thief U is trustworthy, or what Phantom Thief G's endgame actually is. That uncertainty keeps the film engaging past the midpoint, when lesser animated comedies would've run out of steam.
The animation itself deserves mention. Toei Animation brings a level of craft to action sequences and comedic timing that elevates the material. Expressions land harder when they're drawn well. Chase scenes have weight and momentum. Character animation during quiet moments—the way a character's shoulders slump when disappointed, or how they light up when excited—builds investment in these ridiculous characters. And the idol-contest sequences, which could've been throwaway filler, are actually kind of charming. There's something genuinely endearing about watching a butt-shaped detective attempt to perform in an idol show. It shouldn't work. It does.
Where to stream Butt Detective the Movie: Star and Moon online
Butt Detective the Movie: Star and Moon is currently available across major OTT services, with availability varying by region and subscription tier. The exact platforms carrying the film—whether that's Netflix, Prime Video, Hotstar, or other streaming homes—are listed in the Where to Watch widget at the top of this page, which updates in real time as licensing agreements shift. Streaming rights for animated films, especially international titles, can move between platforms, so checking that widget before you hit play saves frustration.
If you're using Movie OTT to track where films land, you'll notice this title is part of a growing wave of anime and animated features finding homes on mainstream streaming platforms rather than staying exclusive to niche services. That's a win for accessibility—more people can discover this film without hunting through three different apps. The 77-minute runtime also makes it perfect for a weeknight watch with kids, or as a palate-cleanser between heavier fare.
Frequently asked questions
Q: Is Butt Detective the Movie: Star and Moon based on an existing franchise?
Yes, it's part of the established おしりたんてい (Butt Detective) series, which has already built a fanbase across multiple media formats in Japan. This film represents the character's big-screen debut in feature form.
Q: Who produced Butt Detective the Movie: Star and Moon?
Toei Animation, the studio behind Dragon Ball, Sailor Moon, and One Piece, produced the film. That pedigree means solid animation quality and experienced handling of comedy and ensemble casts.
Q: How long is Butt Detective the Movie: Star and Moon?
The film runs 77 minutes, making it a tight, focused narrative that doesn't overstay its welcome—ideal for family viewing or as a standalone adventure.
Q: What's the plot of Butt Detective the Movie: Star and Moon?
Butt Detective investigates a missing person connected to an idol contest on Stardust Island, only to uncover a criminal conspiracy. He goes undercover as an idol while teaming up with Phantom Thief U to stop Phantom Thief G's Dark Age Plan.
Q: What's the IMDb rating for Butt Detective the Movie: Star and Moon?
The film holds a 7.5/10 rating on IMDb, suggesting it's connecting with audiences who appreciate its blend of comedy, mystery, and heart.
Final thoughts on Butt Detective the Movie: Star and Moon
Butt Detective the Movie: Star and Moon isn't trying to be anything it's not. It's a goofy, earnest adventure that trusts its premise and executes it with genuine craft. The mystery works, the comedy lands, and the character arcs feel earned—not bad for a film centered on a detective shaped like a butt. If you've got kids who love animated comedies, or if you're the kind of adult who appreciates absurdist humor with actual heart underneath, this one's worth your time. It's exactly the kind of mid-budget animated feature that makes streaming services worth having.
