Can you hear that? That’s the sound of the 8th car (8-Gousha) screaming at the top of their lungs because Bullet Train (Chotokkyu) has officially taken over the nation! We are absolutely buzzing here at Idol Thoughts as the news breaks: the group’s 23rd single, "Gachi Muchuu!", has officially rocketed to #1 on the Billboard Japan Hot 100 for the week of May 11-17, 2026.
This isn't just another chart entry: this is a total victory. Moving a staggering 585,235 copies in its first week according to SoundScan Japan, "Gachi Muchuu!" secured the top spot by a landslide, marking Bullet Train's 4th overall #1 single on the Hot 100. For a group that has been through so much evolution, this moment feels like the ultimate validation of their current 9-member power.
The Stats: A New Record for the 8-Gousha
Billboard Japan’s issue dated May 20, 2026, confirms what we all felt during the release week: the physical sales were off the charts, but the digital presence was equally massive. With heavy rotation on radio and a YouTube MV that has been trending since its premiere, "Gachi Muchuu!" outperformed major competitors like Snow Man and Number_i to claim the throne.
The sales figure: 585,235 copies: represents a new peak for the group, showing that their fanbase is growing faster than ever in this "New Era." It’s a testament to the "Main Dancer / Back Vocal" system that remains the heartbeat of their performance style.
Embracing the "Messy Middle": The Evolution to 9 Members
If you’ve been following Bullet Train as long as I have, you know the journey hasn't been a straight line. From the original 7-member lineup to the departures of Koichi and Yusuke, the group spent years navigating what we call the "messy middle": that transition period where an idol group has to rediscover its identity.
The addition of Shuya, Masahiro, Aloha, and Haru in 2022 was a gamble that paid off in dividends. Today, the 9-member system feels like a finely tuned machine. By blending the veteran leadership of Ryoga, Kai, Takuya, Yuki, and Takashi with the explosive energy of the newer members, Bullet Train has successfully mapped their ecosystem back to the top of EBiDan (Ebisu Dankyuu). They aren't just a group; they are the flagship of the Stardust Promotion idol empire, and this #1 win solidifies their legendary status among their juniors.
A Red-Hot Thank You from Yuki
No. 5 car Yuki, the group’s passionate red main dancer, took to social media and official fan club channels to express his overwhelming gratitude. Known for being the group's "mood maker" and choreographic backbone, Yuki was reportedly moved to tears by the Billboard results.
"To all the 8-Gousha who traveled this path with us: we did it! Seeing 'Gachi Muchuu!' at #1 is a dream come true, but it's only possible because you stayed on the train. Let's keep going to even higher speeds!" : Yuki (No. 5 Car)
The "Gachi Muchuu!" Hook: Why We're Obsessed
If you haven't watched the MV yet, stop what you’re doing and watch it here on the official Bullet Train YouTube channel. The song is a high-octane blend of retro-synth and modern J-pop energy that practically demands you dance along.
The choreography is where the magic truly happens. It’s chaotic, polished, and unmistakably Chotokkyu. The "Muchuu" hand-sign during the chorus has already sparked a viral dance challenge on TikTok, and honestly, we can't stop doing it in the office.
Dining Table Prompt for the 8-Gousha:
We want to hear from you! Which part of the "Gachi Muchuu!" choreography got you hooked? Is it the synchronized "train formation" in the second verse, or is it that killing part in the bridge where the new members take the lead? Let us know in the comments!
Get Your Hands on the 23rd Single
Whether you are a collector or a new fan, this is the definitive release to own. From the Limited Edition box sets featuring the full "EVE" Arena Tour Blu-rays to the individual member covers, there is something for everyone.
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Shop Bullet Train "Gachi Muchuu!" at CDJapan:
- Gachi Muchuu! [Complete Limited Edition] (CD+2Blu-ray)
- Gachi Muchuu! [First Press Limited Edition] (CD+Blu-ray)
- Gachi Muchuu! [Regular Edition]
- Gachi Muchuu! [Yuki Edition]
For our fans in Europe, check out JPU Records for potential international distribution news.
The train isn't slowing down anytime soon. With a Billboard #1 under their belt and a tour on the horizon, the 9-member era of Bullet Train is just getting started. See you at the next station!
