A collaboration event between “The Idolmaster SideM” and Seibuen Amusement Park, titled “Super!! Retro Rose Party,” will be held from October 30 to December 1, 2026.
This is the second collaboration following last year’s event. Special events featuring the cast will be held on October 31, November 1, and November 22, and a stamp rally in conjunction with Tokyo Joypolis will also take place.
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・The event runs from October 30 to December 1, 2026, at Seibuen Amusement Park in Tokorozawa City, Saitama Prefecture
・ On October 31, November 1, and November 22, the “Super!! Retro Rose ‘Special’ Party” will feature appearances by the cast
・A “1-Day Leisure Ticket with Event Admission Ticket” costing 10,000 yen (tax included) is required for participation
・A5 illustration cards will be distributed as part of the “We’re Working! Stamp Rally,” a collaborative event with Tokyo Joypolis
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The Idolmaster SideM “Super!! Retro Rose Party” Event Overview
The “Super!! Retro Rose Party,” a collaboration event between “The Idolmaster SideM” and Seibuen Amusement Park, will be held from October 30 to December 1, 2026. This is the second installment following last year’s “Retro Rose Party.”
Within the park’s Showa-era retro setting, idols from 315 Production—dressed in retro suits—will make an appearance holding roses in full bloom this fall. A post has announced that five units—DRAMATIC STARS, W, Café Parade, S.E.M, and F-LAGS—will participate.
THE IDOLM@STER TM & ©Bandai Namco Entertainment Inc. ©Seibuen Amusement Park All Rights Reserved
| Event Name | The Idolmaster SideM Super!! Retro Rose Party |
|---|---|
| Event Dates | October 30–December 1, 2026 |
| Park Closure Dates | November 18 and November 25, 2026 |
| Venue | Seibuen Amusement Park |
| Address | 2964 Yamaguchi, Tokorozawa City, Saitama Prefecture 359-1145 |
| Inquiries | Seibuen Amusement Park Call Center TEL. (04) 2929-5354 (Hours: 30 minutes before opening until closing time) |
| Special Event Site | Super!! Retros Party Special Event Site |
*Content is subject to change or cancellation without notice.
*Event information and last-minute changes will be announced on the Seibuen Amusement Park official X account.
The Idolmaster SideM “Super!! Retro Rose ‘Special’ Party”
During the three-day event, a special event titled “Super!! Retroze ‘Special’ Party,” featuring the cast, will be held. The venue is the special stage at Let’s Go! Leoland, and it runs for one hour from 6:00 PM to 7:00 PM.
To participate, you must purchase a “1-Day Leisure Ticket with Event Admission Ticket,” priced at 10,000 yen (tax included). This package includes park admission, unlimited rides on attractions, an event admission ticket, and an original bonus item.
THE IDOLM@STER TM & ©Bandai Namco Entertainment Inc. ©Seibuen Amusement Park All Rights Reserved
| Dates | October 31, November 1, and November 22, 2026 (3 days) |
|---|---|
| Event Time | 6:00 PM – 7:00 PM |
| Venue | Let’s Go! Leoland Special Stage |
| How to Participate | Purchase a “1-Day Leisure Ticket with Event Admission Ticket” (sold on a first-come, first-served basis) |
| Ticket Price | 10,000 yen (tax included) |
| Ticket Inclusions | Admission to Seibuen Amusement Park / Unlimited Rides / Event Participation Ticket / Original Goodies |
*Information regarding ticket sales and details will be announced at a later date.
Day 1: Performers on October 31, 2026
On October 31, the opening day, four cast members—who play the members of S.E.M. and Café Parade—will take the stage alongside the two members of W.
・Yusei Kikuchi (as Yusuke Aoi)
・Shosei Yamaya (as Kyosuke Aoi)
・Kento Ito (as Michio Hara)
・Yoshiki Nakajima (as Jiro Yamashita)
Day 2: November 1, 2026 Performers
On November 1, the second day, four cast members portraying the members of DRAMATIC STARS and F-LAGS will take the stage.
・Sogo Nakamura (as Teru Tendou)
・Yufuko Sanpei (as Ryo Akizuki)
・Takahiro Urao (as Daigo Kabuto)
・Toshiya Hiruma (as Kazuki Tsukumo)
Day 3: November 22, 2026 Performers
On the final day, November 22, three cast members playing the members of Café Parade will take the stage.
・Shō Kano (as Yukihiro Kamiya)
・Takuya Kodama (as Makio Uzuki)
・Daiki Kobayashi (as Saki Mizushima)
The Idolmaster SideM “Let’s Get to Work! Stamp Rally”
As part of a joint campaign with Tokyo Joypolis—which is collaborating with “The Idolmaster SideM” during the same period—the “Let’s Get to Work! Stamp Rally” will be held. Collect stamps from both venues to receive an original A5-sized illustration card as a special gift.
THE IDOLM@STER TM & ©Bandai Namco Entertainment Inc. ©Seibuen Amusement Park All Rights Reserved
| Pick Up Your Card | Pick it up at either Seibuen Amusement Park or Tokyo Joypolis |
|---|---|
| First Stamp | Get it stamped at the first facility you visit |
| Second Stamp | Get it stamped at the facility you visit next |
| Claiming Your Reward | Bring your card with stamps from both facilities to the reward pickup location |
| Reward | The Idolmaster SideM Original Reward (A5-sized illustration card) |
*The locations for picking up the stamp rally cards and claiming the special gift will be announced in due course.
Other Events for The Idolmaster SideM “Super!! Retro Rose Party”
Sales of original merchandise, collaboration food items, a rally touring the park, and mini-games have been announced. Details for all of these have not yet been released as of the time of writing.
| Original Merchandise | Scheduled for sale / Details to be announced later |
|---|---|
| Collaboration Food | Scheduled to be served / Details to be announced later |
| Park Rally | Scheduled to take place / Details to be announced later |
| Mini-Games | Scheduled to take place / Details to be announced later |
*As of the time of writing, the contents of the GOODS, FOODS, and RALLY pages on the special website have not yet been released.
The Idolmaster SideM “Super!! Retros Party” Operating Hours During the Event
Operating hours for the collaboration period have been announced for the first two days: October 30 and 31. Hours for November 1 and beyond will be announced sequentially.
| October 30 and 31 | 10:00 a.m. – 5:00 p.m. |
|---|---|
| November 1, 2026 and later | To be announced in stages |
| Where to Check | Seibuen Amusement Park Operating Hours Page |
*All prices include tax.
*Images are for illustrative purposes only.
The Idolmaster SideM Frequently Asked Questions About the “Super!! Retro Rose Party”
When and where will it be held?
It will be held at Seibuen Amusement Park in Tokorozawa City, Saitama Prefecture, from October 30 to December 1, 2026. The park will be closed on November 18 and November 25.
How do I participate in the special event?
You must purchase a “1-Day Leisure Ticket with Event Participation Pass” for 10,000 yen (tax included). Tickets are sold on a first-come, first-served basis and include park admission, unlimited rides, an event participation pass, and an original bonus item. Ticket sales and further details will be announced at a later date.
What is the reward for the stamp rally?
An A5-sized illustrated card. Collect stamps at both Seibuen Amusement Park and Tokyo Joypolis, then bring your completed card to the reward pickup location to receive it.
Have the details about merchandise and food been announced?
As of this writing, they have not been announced. The organizers have announced that original merchandise will be sold, there will be collaborative food items, a rally around the park, and mini-games.
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For details, please check the official website.
*Please note that the information in these articles may be out of date; we ask that you check the official website for the latest details.
THE IDOLM@STER TM & ©Bandai Namco Entertainment Inc. ©Seibuen Amusement Park All Rights Reserved
