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When ‘Isekai Konbo Daibutokai’ (roughly, ‘The Great Otherworldly Mixed Ball’) dropped in the summer of 2022, most of us filed it under ‘fun movie theme song, nice groove, moving on.’ Coming back to it from the second half of the 2020s, it plays completely differently. This is Gen Hoshino mid-pivot — the moment the singer-songwriter starts quietly rebuilding himself as a synth-stacking track guy, and you can hear him testing every wire.
A song that landed as a festival single now reads like a blueprint — the exact hinge between Gen Hoshino’s second and third eras. Back then it was ‘the cute dance track from the ghost movie.’ A few years later, it sounds like the schematic for everything that came after.
I first heard it in a trailer. Maybe four seconds of that synth intro and I remember thinking, okay, this isn’t going to sit politely inside the film. I couldn’t articulate why at the time. Line it up with the singles that followed and the hunch finally has words. So consider this the review I couldn’t write in 2022.
Key facts
- Released July 18, 2022 as a digital-only single on SPEEDSTAR RECORDS. Written, composed and arranged by Gen Hoshino himself.
- Theme song for the film GHOSTBOOK Obakezukan (dir. Takashi Yamazaki), which opened July 22, 2022.
- Co-arranged with mabanua, following on from the previous single ‘Kigeki.’ Programmed drums, with programming credited to Hoshino and mabanua, over a stack of vintage synths.
- The fully animated music video was directed by Yuki Igarashi, the animator behind the season 1 ending sequence of Jujutsu Kaisen.
- Released as a standalone single, outside the arc of the 2023 EP LIGHTHOUSE. In hindsight it reads as the starting point of the programmed, synth-forward direction that would run through ‘Seimeitai.’
Where Hoshino was standing that summer
Short version: this track sits right on the seam between his second era and his third. After closing out phase two with POP VIRUS in 2018, he spent the pandemic years lobbing out singles one at a time — ‘Fushigi,’ ‘Sozo,’ ‘Cube,’ ‘Kigeki’ — with no album in sight to tie them together. Little standalone experiments, no obligation to add up. ‘Isekai Konbo Daibutokai’ is another one of those.
The write-ups at the time mostly leaned on the movie-theme brightness, the danceability, and how sharp Yuki Igarashi’s animation looked. All fair. But once you add ‘Seimeitai’ from 2023, then the LIGHTHOUSE EP, then whatever he’s been doing since, the thing this song was actually testing — ‘can I make people dance using nothing but a wall of synths?’ — becomes the backbone of everything else. What looked like a party track for a kids’ movie in 2022 looks like the design document for the next three or four years. Same audio file, different job. Pop music does this sometimes.
Written for a movie, but never trapped inside it
Digital single via SPEEDSTAR RECORDS on July 18, 2022, tied to Takashi Yamazaki’s GHOSTBOOK Obakezukan, which hit theaters four days later. The ‘feat. Obake’ credit — literally ‘featuring ghosts’ — is Hoshino’s own joke about the presences he says were hanging around the studio during recording.
He was announced as theme song artist on May 25, 2022. In his statement, he said he wanted to write something where the border between this world and the next dissolves, where the living and the not-living end up on the same dance floor. That framing pays off later. The ‘humans plus not-humans’ idea gets rerouted the following year into ‘Seimeitai,’ where the mix he’s chasing is ‘humans as living organisms.’ The through-line is easier to see now than it was then.
The other thing that ages well: this is a theme song that isn’t dependent on its film. You don’t need to have seen GHOSTBOOK for the track to land. It’s not a plot device with a beat under it — it’s a self-contained ball you can attend on your own. That distance from the tie-in becomes a pattern for how he approaches commissioned work from here on.
A synth museum that somehow sounds light
The thing I most want to underline in hindsight: this song uses heavy gear to make a light sound. That contradiction is the whole trick.
The credits are almost comedic. Hoshino and mabanua, between them, run through Prophet-5, DX-7, Juno-6, Jupiter-8, OB-Xa, Minimoog, Matrix-12, PPG Wave 2.0, Emulator II, CZ-101, Music Easel, MS-20, Clavinet, and a Theremin. Basically a syllabus of late-’70s and ’80s synthesis stacked into one track. Drums are programmed, credited to the two of them. Per a Drum Magazine Web breakdown, the first chorus leans on a slip-beat feel, with tight fills, springy hi-hat nuance, a pickup fill going into the second chorus, and a drum sound built carefully enough that the whole thing reads as a live-feeling dance number even though it isn’t played on kit.
Usually, when you pile up that much vintage synth, the record starts to smell like boogie or cosmic disco — great, but a heads-only sound. This one doesn’t. It stays pop enough to work as the theme song for a family film. That contradiction is the core of the mabanua-era Hoshino sound.
Listening as a music writer, the real trick is in the mix depth and the way each synth is assigned a job. The analog basses are fat down low, but the DX and PPG parts up top are deliberately kept airy. Centre of gravity drops, perceived weight floats. The tempo sits in a strange middle lane — not marching, not disco-fast — a pace where, sure, a ghost could dance without getting winded.
That lightness isn’t in the performance. It’s in the architecture. In 2022 this got waved through as ‘another fun mabanua collab,’ but with distance it plays as a deliberate warm-up lap before he fully committed to programmed synth-pop. ‘Kigeki’ still had acoustic warmth in it. This one already has a foot in the machine. And mabanua — a producer and drummer known for his Ovall work, solo beatmaking and a long list of R&B and jazz-adjacent productions — tends to protect Hoshino’s vocal presence and rebuild everything around it. Voice stays put, the frame moves. ‘Kigeki’ set up the template; this track pushed it further toward gear and programming.
The MV: why Yuki Igarashi mattered
Same delayed-reaction thing with the video. Director Yuki Igarashi is the animator who did key work on the season 1 ending of Jujutsu Kaisen, who handled storyboarding, direction, animation supervision and in-episode design on episode 3 of Keep Your Hands Off Eizouken! while reportedly drawing around 60% of that episode’s key animation himself, and who made his directorial debut with ‘Lop and Ochō’ for Star Wars: Visions. That’s a specific hire.
In 2022 the framing was ‘oh, the Jujutsu Kaisen ED guy is doing it.’ Fast-forward through the boom in anime music videos, and international listeners finding J-pop through anime pipelines, and Hoshino handing the whole video over to an auteur animator — no live action, no artist cameo — starts to look like an early call on where J-pop MV strategy was heading. Choosing animation is also a way for Hoshino, a working actor with a very recognizable face, to take himself out of the frame. The songwriter steps back, the characters and choreography carry it. That distance shows up again in later work.
Between ‘Kigeki’ and ‘Seimeitai’
Lay his 2020s out in order and the position gets clean. 2021: ‘Fushigi,’ ‘Sozo,’ ‘Cube.’ 2022: ‘Kigeki’ (feat. DJ Jazzy Jeff & Kaidi Tatham), then this one. 2023: ‘Seimeitai’ and the LIGHTHOUSE EP.
In that sequence, ‘Isekai Konbo Daibutokai’ is the knot tying the sunshine of ‘Kigeki’ to the motion of ‘Seimeitai.’ ‘Kigeki’ still carried live-band flirtation and acid-jazz aroma; this track shoves the door open on the synth side; ‘Seimeitai’ then jumps to full-on higher-BPM, synth-led pop. The minimal, introspective world of LIGHTHOUSE is a different lane entirely — but the prototype for the outward-facing, dance-forward mode is right here.
His posture as a writer shifts too. Second-era Hoshino was famously the guy who found small light inside ordinary days. Here he reaches straight for cartoonishly non-ordinary imagery — otherworlds, a ball, dancing with ghosts, the border between here and there smudging. A writer who built his rep on making the everyday shine is now trying to illuminate the everyday from the outside in.
Hoshino has been remaking himself at every checkpoint: acoustic solo-artist beginnings, then a second era — the ‘Koi’ years — running soul, funk and city-pop through Japanese-language pop, then a third era where programming, synths, overseas collaborators and his radio and podcast work all run in parallel. This song might be the last moment where the band-era body language and the programmed-track thinking are both in the room, breathing at the same time.
How it actually gets listened to
Personal read, but I think this song is basically two different tracks depending on when and where you play it. In a café in the afternoon, it’s the bright movie tune. Late at night, in a car with the volume up and low end that actually moves, that analog bass climbs to the front and the whole thing pivots — suddenly it’s a disco track.
So if your memory of this song is frozen at ‘oh yeah, from that movie,’ try it once in a real environment. Summer night, windows down, driving. There’s a moment where the border between this side and the other really does get a little thin. I think it was engineered to work exactly like that, and the way it got consumed as a one-off single in 2022 kind of skipped over this part.
Why isn’t this on an album?
One thing nags me: this song never landed cleanly on a physical album afterward. The 2023 LIGHTHOUSE EP is a concept piece running on a different axis. So ‘Isekai Konbo Daibutokai’ is still floating out in streaming as a movie-theme single that never got folded into an album narrative.
I don’t read that as a negative. If anything it’s evidence that Hoshino, at this point, was consciously running experiments at the single level rather than the album level. Drop it, let people take it as a one-off, move on. Which means it’s exactly the kind of track that keeps rewarding people who come back later.
Here’s where readers can genuinely split. Is this a fun theme song and nothing more, or is it the turning point where his sound reorganized itself? Both readings hold up. I don’t think you have to choose — the fact that you can flip between them mid-listen is part of why the song stays interesting. Which one do you actually hear when you put it on?
What to play next
If this is your entry point, the natural follow-up is ‘Seimeitai’ (2023) — the synth-forward, programmed-pop instinct this song opened up, played faster and more openly. Then queue the LIGHTHOUSE EP (2023) right after for the opposite side: quieter, more inward, running at the same time as the dance-mode Hoshino. Dancing Hoshino and thinking Hoshino, side by side. That’s how the 2020s version of him actually makes sense.
One last note on the ‘feat. Obake’ credit, because it’s grown on me. It borrows the feature-artist convention from hip-hop and R&B and hands the guest slot to ghosts. Per Hoshino’s own comment, some fun paranormal stuff happened while they were tracking, so he had the ghosts hanging around do some backing vocals while they were there. Take it as a joke, or take it as a way of describing the trance state you get into stacking parts for hours in a studio. Either way, giving the feature credit to something non-human feels connected to how he later widens his frame — beyond humans to living things, beyond the everyday to the not-quite-everyday. A festival single quietly turning into a design document. Put it on tonight with the volume up and dance to it once more.
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