A collaboration between “Gakuen Idolmaster” and the Seibu-Chichibu Station Front Hot Spring “Matsuri no Yu,” titled “Take the Seibu Railway! A Journey Through the Misty Hot Springs Amid Mountain Scenery,” will begin on October 16, 2026.
The event will feature collaborative Chichibu gourmet menus, merchandise with limited-edition illustrations, and a digital stamp rally touring Chichibu City. Seibu Railway will also sell commemorative tickets for the event.
・Held from October 16 to November 29, 2026
・Admission set tickets that include a tenugui, and collaborative Chichibu gourmet menus
・Matsuri-no-Yu-themed merchandise, and a glitter postcard with every 2,000 yen spent
・A digital stamp rally touring Chichibu City and commemorative train tickets
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Gakumasu “Matsuri no Yu Collaboration” Event Overview
A collaboration between “Gakuen Idol Master” and Matsuri-no-Yu, a hot spring resort located in front of Seibu-Chichibu Station in Chichibu, Saitama, is taking place. At Matsuri-no-Yu, you can enjoy original merchandise, a collaboration menu featuring Chichibu cuisine, and special in-house decorations.
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
| Event Name | Gakuen Idolmaster × Seibu Chichibu Station Front Hot Spring “Matsuri no Yu” “Take the Seibu Railway! A Journey Through the Mountains Shrouded in Hot Spring Steam” |
|---|---|
| Event Dates | October 16–November 29, 2026 |
| Venue | Seibu Chichibu Station Hot Spring: Matsuri no Yu Nosaka-cho, Chichibu City, Saitama Prefecture 1-16-15 |
| Admission & Access | Hours & Admission/Directions |
| Special Event Page | Matsuri-no-Yu Official Website |
| Official X | @matsurinoyu |
| Matsuri no Yu (Hot Spring Area) | 10:00 a.m.–10:00 p.m. (Last admission at 9:30 p.m.) |
|---|---|
| Chichibu Yudai-kura (Hot Spring Area) | 11:00 a.m.–9:30 p.m. (Last Order 9:00 p.m.) |
| Matsuri no Utage (Food Court) | Weekdays 11:00 AM–6:30 PM (Last Order 6:00 PM) Weekends and Holidays 11:00 AM–7:30 PM (Last Order 7:00 PM) |
| Chichibu Souvenir Market (Shopping Area) | Weekdays 9:00 AM–6:30 PM Weekends and Holidays 9:00 AM–7:30 PM |
* Admission to the Festival Feast (Food Court) and Chichibu Souvenir Market is free
* An admission fee is required to enter Chichibu Yudai-kura
* All prices include tax
Gakumasu “Matsuri no Yu Collaboration” Set Ticket with Tenugui Towel
Admission set tickets, which include hot spring admission and a tenugui (one of 6 random designs), are sold at the hot spring front desk. The price is the hot spring area admission fee plus 1,100 yen.
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
*You may purchase up to two additional tenugui per visit (1,100 yen per towel)
*Available for purchase only at the entrance reception desk
*Cannot be purchased with invitation tickets, exchange tickets, or advance tickets
*Available while supplies last
Gakumasu “Matsuri no Yu Collaboration” Menu
Collaboration Food
This menu features Chichibu gourmet dishes inspired by the idols. For every dish you order, you’ll receive a mini-character coaster (13 varieties total; distributed at random).
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
Saki Hanami, Temari Tsukimura, and Kotone Fujita’s Exquisite!! Waraji Katsu Don – 1,680 yen (Matsuri no Utage)
Seina Jūō, Misuzu Hata, and Yume Hanami’s Chichibu Kabosu-Scented Pork Miso Bowl: 1,680 yen (Matsuri no Utage)
China Kuramoto & Hiroshi Shinozawa’s Pre-Lesson Energy Boost: Miso Potato—650 yen (Matsuri no Utage)
Amaya Tsubame, Mao Arimura, and Rina Himezaki’s Berry Berry Shake 750 yen (Festival Banquet)
Katsuragi Ririya & Shion Seika’s Chichibu Enjoyment♪ Set Meal 1,980 yen (Chichibu Yudai-ko)
Ameya Tsubame, Mao Arimura, and Rina Himezaki’s “Potekuma-kun Hand Sherbet” 500 yen (Chichibu Yu Kitchen)
Collaboration Drink
For every item you order, you’ll receive a life-size coaster (13 varieties total; distributed at random).
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
Hatsuboshi Academy School Store-Style Ramune (13 varieties total) 800 yen (Festival Banquet)
Hatsuboshi Academy Cafeteria-Style Coffee Milk (2 varieties total) 1,100 yen (Chichibu Yudai-kura)
*The designs on the ramune labels and coffee milk bottles are random. You may take the bottles home.
*Coaster designs are random and available while supplies last.
Gakumasu “Matsuri no Yu Collaboration” Merchandise
Merchandise featuring exclusive collaboration illustrations will be sold at the Chichibu Souvenir Market. For every 2,000 yen spent per transaction, you’ll receive a glitter postcard (13 varieties total; distributed at random).
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
Acrylic Figure Stands: Matsuri no Yu Ver. (13 Varieties Total) 2,200 yen each
Acrylic Figure Stands: Seibu Railway Ver. (3 Varieties Total) 2,200 yen each
Mini Character Acrylic Stands: Potekuma-kun Ver. (13 varieties total) 1,320 yen each
Trading Foil-Stamped Matte Pin Badges: Matsuri no Yu Ver. (13 Varieties Total) 660 yen; Complete Set 8,580 yen
Trading Holo Pin Badges: Matsuri no Yu Mini-Character Ver. (13 Varieties Total) 660 yen; Complete Set: 8,580 yen
Trading Clear Cards: Matsuri no Yu Ver. (13 Varieties Total) 550 yen; Complete Set 7,150 yen
Kerorin × Gakuen Idol Master Mini Kerorin Bucket Keychain: Matsuri no Yu Ver. (13 Varieties Total) 990 yen each
Collectible Public Bath Key-Style Wooden Tag Keychains: Matsuri no Yu Ver. (13 Varieties Total) 770 yen; Complete Set 10,010 yen
IC Card Stickers: Seibu Railway Ver. (3 Varieties Total) 715 yen each
Goshuin Paper: 550 yen
Goshuin Album: 3,300 yen
Ume-Flavored Arare (with Original Card) 1,620 yen
Folding Fans (3 Varieties) 3,520 yen each
Chichibu Potato: Gakuen Idolmaster Collaboration (13 varieties total) 300 yen each
*Glitter postcards cannot be combined with other purchases. Available while supplies last.
*Please notify a staff member if using the self-checkout.
The Idolmaster “Matsuri no Yu Collaboration” Digital Stamp Rally
Visit facilities in Chichibu City where life-size panels are displayed and collect stamps. Depending on the number of stamps you collect (3, 5, or 8), you’ll receive event-exclusive original images (3 types total). Participation is free.
Digital Stamp Rally
Event Period
October 16, 2026 – November 29, 2026, 11:59 PM
Checkpoints
Matsuri-no-Yu / Jigen-ji Temple/Shōrin-ji Temple/Jibasan Store/Chichibu City History and Culture Heritage Center/Hot Spot Chichibu Hall/Chichibu Festival Hall/Chichibu Meisen Museum
Rally Map
Rally Map (PDF)
| Event Period | October 16, 2026 – November 29, 2026, 11:59 PM |
|---|---|
| Checkpoints | Matsuri-no-Yu / Jigen-ji Temple/Shōrin-ji Temple/Jibasan Store/Chichibu City History and Culture Heritage Center/Hot Spot Chichibu Hall/Chichibu Festival Hall/Chichibu Meisen Museum |
| Rally Map | Rally Map (PDF) |
*A LINE account is required to participate
*The QR code for participation is scheduled to be released on October 16
*You can participate regardless of each facility’s operating hours
Upon entering the Chichibu Meisenkan or Chichibu Festival Hall, each person will receive one A5 clear file (2 designs available).
THE IDOLM@STER™& ©Bandai Namco Entertainment Inc.
*Bonus Item 1 is distributed at Chichibu Meisenkan; Bonus Item 2 is distributed at Chichibu Festival Hall
*An admission ticket for each facility is required. Available while supplies last
Gakumasu “Matsuri no Yu Collaboration” Commemorative Train Ticket
Seibu Railway will be selling a commemorative train ticket (Seibu Line 1-Day Free Pass) featuring an original mount with an exclusive illustration by Kotone Fujita, depicting Sakiki Hanami, Temari Tsukimura, and Kotone Fujita.
| Sales Period | October 16–November 29, 2026 |
|---|---|
| Sales Locations | Customer Information Counters at Seibu-Chichibu Station and Ikebukuro Station *Available at Ikebukuro Station starting October 17 |
| Price | 2,000 yen |
| Validity Period | Valid for one day only through December 31, 2026 |
| Details | Seibu Railway Official Website |
*On October 16, a special sale will be held at Seibu-Chichibu Station starting at 8:30 a.m.
*Only 5,000 tickets will be available; sales end once they are sold out.
* Cash only
Frequently Asked Questions about Gakumasu’s “Matsuri no Yu Collaboration”
How long will the event run?
From October 16 to November 29, 2026.
Can I enjoy the event even if I don’t bathe in the hot springs?
Yes, you can. Admission to the “Matsuri no Utage” food court and the “Chichibu Souvenir Market” is free. However, a hot spring admission fee is required to access the menu at “Chichibu Yudai-ko” within the hot spring area.
How much does the stamp rally cost?
It’s free. You’ll need a LINE account to visit the eight checkpoints throughout Chichibu City.
Where can I buy the commemorative train ticket?
For 2,000 yen at the customer information counters at Seibu-Chichibu Station and Ikebukuro Station. Sales at Ikebukuro Station begin on October 17. A total of 5,000 tickets will be available.
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Please check the official website for details.
*Please note that the information in this article may be out of date; we kindly ask that you verify the details on the official website.
THE IDOLM@STER® & © Bandai Namco Entertainment Inc.
