Sega and Colorful Palette have announced a special broadcast to celebrate the 6th anniversary of Project Sekai: Colorful Stage! feat. Hatsune Miku, scheduled for September 24, 2026 at 19:30 JST. The stream promises new anniversary information, game updates, and appearances from beloved voice actors, all as part of a broader celebration that extends into October with live events and theatrical screenings.
If you're wondering what exactly will be revealed during the broadcast, who's appearing, and how it fits into the larger anniversary festivities, here's everything we know so far.
The Quick Version
- The Proseka Broadcasting Station 6th Anniversary Special is scheduled to stream on September 24, 2026 at 19:30 JST
- Four voice actors will appear: Isobe Karin (Tenma Saki), Furihata Ai (Momoi Airi), Akina (Azusawa Kohane), and Suzuki Minori (Shinonome Ena)
- The broadcast will unveil new 6th anniversary content, game updates, and other announcements for the rhythm game
- This stream is part of a larger celebration including a live event at Tokyo Metropolitan Gymnasium on October 3-4, 2026
- The specific streaming platforms haven't been officially confirmed yet, though previous broadcasts have typically appeared on YouTube and similar services
When and Where to Watch the Anniversary Broadcast
The special broadcast is set to begin on Thursday, September 24, 2026 at 19:30 Japan Standard Time. According to the official announcement, it will be distributed as an online stream, following the format of the regular Proseka Broadcasting Station information programs that have kept fans updated throughout the game's history.
While the exact streaming platforms haven't been specified in the announcement, we can expect the broadcast to appear on the channels where Project Sekai typically hosts these events. The production companies behind the game—Sega Corporation and Colorful Palette—have a track record of making these streams widely accessible to the international fanbase that has grown around the mobile rhythm game since its launch six years ago.
Who's Appearing on the Special Broadcast
Four voice actors who bring Project Sekai's characters to life will join the broadcast as special guests. Isobe Karin, who voices Tenma Saki, will appear alongside Furihata Ai (Momoi Airi), Akina (Azusawa Kohane), and Suzuki Minori (Shinonome Ena). These four represent different units within the game's story, suggesting we might hear updates relevant to each of their character groups.
The cast members are expected to help present the new information and anniversary announcements, likely sharing their own reflections on the game's six-year journey. Previous Proseka Broadcasting Station episodes have blended information reveals with more personal moments from the voice actors, creating a connection between the performers and the community that has supported the game through its evolution.
What Kind of Announcements We Can Expect
The official description promises "various new information" about Project Sekai's 6th anniversary, along with game update details. Based on what we know about the broader anniversary campaign, the broadcast will likely cover several major topics that fans have been anticipating.
First, there's the upcoming Project Sekai 6th Anniversary Thanks Festival—a live event scheduled for October 3-4, 2026 at Tokyo Metropolitan Gymnasium. This real-world celebration will feature reading dramas with original scenarios created exclusively for the event, a talk show reflecting on six years of memories, and a special live performance combining unit songs with appearances by virtual singers. The September 24 broadcast seems positioned to reveal additional details about this festival, perhaps including setlists, specific segments, or special guests.
We're also likely to hear about in-game anniversary campaigns. Six-year milestones typically bring login bonuses, limited-time events, special gacha opportunities, and commemorative content for players. The rhythm game has a history of celebrating these moments with generous rewards and story content that deepens the world of its five musical units and the mysterious "SEKAI" spaces they inhabit.
New music is another strong possibility. The 6th anniversary celebration has already been connected to songs like "Lapse" (ラプス) by kr-KuuRa, which came from the 33rd installment of the game's community song contest series. The broadcast could unveil additional tracks, collaborations, or cover songs featuring Hatsune Miku and the other Crypton Future Media virtual singers who share the spotlight with Project Sekai's original characters.
How This Fits Into the Larger Anniversary Celebration
The September 24 broadcast serves as the information hub for a multi-week celebration that extends well into October. Beyond the Tokyo Metropolitan Gymnasium event on October 3-4, fans who can't attend in person will have the option to experience the Thanks Festival through live viewings at cinemas across Japan. These screenings are scheduled for October 3 at 12:30 and October 4 at 16:00, with ticket sales happening in multiple phases.
There's also a paid streaming option through ABEMA for those who want to watch from home, along with merchandise and other commemorative items tied to the anniversary. The September 24 broadcast will likely clarify how all these pieces fit together, what exclusive content each format offers, and perhaps reveal any surprises that haven't been announced yet.
For international fans, these anniversary celebrations highlight how Project Sekai has grown beyond its Japanese origins. While the game launched as a domestic mobile title in September 2020, it has since expanded globally with localized versions and a community that spans multiple continents. The 6th anniversary represents not just longevity but the game's success in blending the established Vocaloid fanbase with new audiences drawn to its original characters, storytelling, and rhythm gameplay.
The Significance of Six Years for Project Sekai
Reaching a 6th anniversary is a meaningful milestone in the mobile game landscape, where many titles struggle to maintain relevance beyond their first few years. Project Sekai has managed to sustain player interest through regular content updates, an evolving story that gives each of its twenty original characters room to grow, and a music library that now includes hundreds of songs spanning Vocaloid classics and contemporary commissions.
The game's formula—combining rhythm gameplay with visual novel-style story sequences and gacha collection mechanics—has proven durable in part because it serves multiple audiences. Longtime Vocaloid fans appreciate hearing Hatsune Miku, Kagamine Rin and Len, Megurine Luka, MEIKO, and KAITO perform both beloved classics and new material. Players who discovered the franchise through Project Sekai have grown attached to the original units: Leo/need, MORE MORE JUMP!, Vivid BAD SQUAD, Wonderlands×Showtime, and Nightcord at 25:00.
Each unit explores different musical genres and themes, from Leo/need's band rock to Nightcord at 25:00's introspective electronic soundscapes. This diversity has helped the game maintain a broad appeal even as player tastes evolve. The 6th anniversary celebration, with its mix of real-world events and in-game content, reflects the developers' understanding that their community values both the digital experience and opportunities to gather in shared physical spaces.
What People Are Saying
Fans across social media have been expressing excitement about the upcoming broadcast and what it might reveal. The announcement has sparked conversations about favorite moments from the past six years and speculation about what anniversary surprises might be in store.
One longtime player shared their anticipation for potential anniversary cards, noting how the limited gacha banners around major milestones often feature some of the most detailed and beautifully illustrated character designs. They're hoping the broadcast will preview which characters will receive special anniversary variants and what costumes or themes those cards might explore.
Another fan mentioned their hope for news about the October live event, particularly whether any special collaborative performances might be announced. The intersection of voice actors performing as their characters alongside the virtual singers has become a highlight of Project Sekai's real-world events, and the 6th anniversary seems like the perfect occasion for something memorable.
International fans have also been vocal about wanting to know whether any of the anniversary content will be accessible to players outside Japan. While the Tokyo events are naturally region-specific, previous celebrations have included global in-game campaigns, and there's cautious optimism that the September 24 broadcast will confirm similar treatment for the 6th anniversary rewards and events.
Frequently Asked Questions
When is the Project Sekai 6th Anniversary broadcast?
The special broadcast is scheduled for September 24, 2026 at 19:30 JST. The exact streaming platforms haven't been officially announced yet, but previous broadcasts have typically been available on YouTube and similar services where Project Sekai maintains official channels.
Will the broadcast be available with English subtitles?
The announcement hasn't specified language support, but Project Sekai's global presence means there's a possibility of subtitles or fan translations. We'll likely learn more details about accessibility options as the broadcast date approaches.
What is the 6th Anniversary Thanks Festival?
It's a live event taking place on October 3-4, 2026 at Tokyo Metropolitan Gymnasium in Japan. The festival will feature reading dramas, a talk show, and a special live performance. Fans who can't attend can watch through cinema live viewings across Japan or via paid streaming on ABEMA.
Will there be in-game anniversary rewards?
While specific rewards haven't been announced yet, the September 24 broadcast is expected to reveal details about in-game anniversary campaigns, which typically include login bonuses, special events, and commemorative content for players.
Can international fans participate in the anniversary celebration?
The live events in Tokyo and cinema viewings are Japan-focused, but in-game content is usually available to all players regardless of region. The September 24 broadcast should clarify what anniversary content will be accessible globally through the game itself.
Looking Ahead to September 24 and Beyond
The upcoming broadcast represents the first major reveal of what Project Sekai has planned for its 6th anniversary celebration. With four beloved voice actors set to appear and promises of new information spanning both in-game updates and the October live event, September 24 will likely set the tone for how the next several weeks unfold for the community.
We're expecting details about the Tokyo Metropolitan Gymnasium event, clarification on in-game campaigns and rewards, and possibly announcements about new music or story content. The broadcast serves as both a thank-you to the fans who have supported the game through six years and a preview of what's coming next as Project Sekai continues its journey.
For those planning to watch, marking September 24, 2026 at 19:30 JST on your calendar is the first step. As we get closer to the date, official Project Sekai channels will likely share more specific information about where to watch and what to expect, ensuring that fans around the world can join in celebrating this milestone together.
