32nd Oku-Musashi Ultra Marathon 2025

Overview

The 32nd Oku-Musashi Ultra Marathon, held on Sunday, October 19, 2025, is a challenging endurance event organized by Sports Aid Japan at Moroyama General Park, Moroyama Town, Saitama Prefecture, Japan. This 70km race, held rain or shine, has a capacity of 1,000 participants and is designed for experienced runners aged 20+ who have completed a marathon (42.195km or more) since October 2022. The course, with a maximum elevation difference of 748m and cumulative elevation gain of 2,134m, traverses the rugged and scenic Oku-Musashi region, connecting Moroyama’s trails and local communities. Registration is open from June 20 to September 19, 2025, via Jasumo Tickets or the official website (http://sportsaid-japan.org), closing when capacity is reached. Highlights include a commemorative T-shirt (designed by Kenichi Yanagisawa, optional), team awards (top 5 men, top 4 women per club), finisher awards (10th, 20th, 30th), online finisher certificates, and a unique “give entry” system for transferring entries. Praised on X for its “stunning trails and vibrant local support,” the event offers 20 aid stations, free parking, and shuttle buses for accessibility.

Why Attend

• Challenging Course: Tackle a 70km trail with 2,134m elevation gain, noted on X as “a true test of endurance with breathtaking Oku-Musashi scenery.”

• Exclusive for Experienced Runners: Designed for those who’ve completed a marathon since October 2022, ensuring a competitive field.

• Unique Features: Optional commemorative T-shirt, team awards for clubs, and special finisher awards (10th, 20th, 30th place).

• Give Entry System: Transfer entry rights to another runner if unable to participate (credit card payments only, with transfer fee).

• Participant Perks: 20 aid stations, changing rooms, luggage storage, free parking, and shuttle buses from Moro and Bushunagase stations.

• Community Support: Local residents and volunteers create a festive atmosphere, praised on X for “heartwarming cheers and aid station hospitality.”

Event Details

Events and Courses

Sunday, October 19, 2025 – Moroyama General Park, Moroyama Town, Saitama Prefecture:

• 70km Race:

  • Categories: Men (20–39, 40s, 50s, 60+), Women (20–39, 40s, 50s, 60+).

  • Course: Starts and ends at Moroyama General Park, covering a rugged 70km loop through Oku-Musashi’s trails, with a maximum elevation difference of 748m and cumulative elevation gain of 2,134m. Features single-track trails and remote sections, as noted in prior races.

  • Time Limit: 11 hours (until 6:00 PM); checkpoints at 23.5km, 45.4km, 51.8km, 62.5km, and 65.2km.

  • Start: 7:00 AM.

  • Details: Competitive race for experienced runners; requires prior marathon completion (42.195km+, post-October 2022). 20 aid stations with toilets, kilometer markers, and timing chips. Runners must stay on the left side of roads, watch for vehicles, and dispose of trash at designated spots.

• Course Features: Scenic and rugged, with curves and poor visibility in some areas; no traffic restrictions, so caution for vehicles is required. Sudden weather changes possible, so preparation for mountain conditions is advised. Course map: https://www.sportsentry.ne.jp/s3_files/20240605144810684_okumusashi.pdf.

• Format: Follows Sports Aid Japan rules; timing chips for accurate recording. Awards for 1st–3rd per division (1st–6th for men 40s/50s), team awards (top 5 men, top 4 women per club), and special finisher awards (10th, 20th, 30th).

Eligibility

• General:

  • Men and women aged 20+ on race day, who have completed a marathon (42.195km or more) since October 2022.

  • Sufficient training for rugged courses; participate at own risk (sports injury insurance provided).

  • Agree to event terms and conditions; no substitute runners, event changes, or cancellations post-registration.

• Restrictions: False info (age, gender, etc.) or proxy runners lead to disqualification and future bans. One event per person.

Capacity

• Total: 1,000 participants (70km race).

• Note: Registration closes when capacity is reached or on September 19, 2025.

Features

• Awards:

  • Individual: 1st–3rd per division (1st–6th for men 40s/50s); certificates and prizes.

  • Team: 1st–3rd for men’s teams (top 5 combined times per club), women’s teams (top 4 combined times per club).

  • Finisher Awards: 10th, 20th, 30th place finishers.

• Participation Prize: Commemorative T-shirt (designed by Kenichi Yanagisawa, optional; +500 yen).

• Optional Item: Sports cap (2,300 yen, includes shipping, unisex, adjustable; order at registration or post-registration).

• Finisher Certificates: Published online at http://sportsaid-japan.org after the event.

• Services: 20 aid stations with toilets, changing rooms, free luggage storage, first aid, sports injury insurance.

• Media: Photos, videos, and results may be published on TV, newspapers, magazines, or online; organizers own rights.

• Give Entry System: Transfer entry rights to another runner if unable to participate (credit card payments only; transfer fee applies). Details: https://faq.sportsentry.ne.jp/hc/ja/sections/4416523762585.

Ticket Information

Event Date & Time

• Location: Moroyama General Park, 1221 Asuwa, Moroyama-machi, Iruma-gun, Saitama Prefecture, 350-0455, Japan (Google Maps: https://maps.app.goo.gl/9z8k6s3z9k6s8z9).

• Date: Sunday, October 19, 2025 (held rain or shine; canceled for major disasters).

• Schedule (Tentative):

  • 6:20 AM: Opening ceremony.

  • 7:00 AM: 70km race start.

  • ~6:00 PM: Event conclusion (11h time limit).

• Duration: Approximately 11 hours (7:00 AM–6:00 PM).

• Note: Number cards, timing chips, and programs sent in advance (early October 2025); no on-day registration. Check http://sportsaid-japan.org for updates. Notify address changes to Secretariat (049-294-5603).

Purchase Channels

• Jasumo Tickets: Contact Jasumo Tickets (https://jasumotickets.com/contact) for bilingual support. Specify category, T-shirt option, sports cap, and access method.

• Official Website: Apply via http://sportsaid-japan.org or Sports Entry platform. Provide prior marathon proof (post-October 2022).

• Give Entry: Transfer entries via Sports Entry (credit card payments only; fee applies). Details: https://faq.sportsentry.ne.jp/hc/ja/sections/4416523762585.

• Note: Provide age, email, club/team affiliation, T-shirt size (if applicable), and access method. Address changes by September 19, 2025, to Secretariat (049-294-5603).

Rules

• Application:

  • June 20–September 19, 2025, 12:10 PM JST; first-come, first-served.

  • No event changes, cancellations, or refunds post-registration.

  • Provide proof of marathon completion (42.195km+, post-October 2022).

• Course Rules:

  • Stay on left side of roads; no traffic restrictions, so watch for vehicles, motorcycles, and bicycles.

  • Navigate curves with poor visibility cautiously.

  • Retire if unwell or missing checkpoint times; board vehicle at checkpoints.

  • Dispose of trash at designated spots; use toilets at aid stations only.

  • Prepare for sudden weather changes in mountainous areas.

• Cancellation: No refunds for disasters, incidents, or personal reasons.

• Liability: First aid and sports injury insurance provided; no further liability. Participants responsible for accidents (no family objections).

• Media: Photos, videos, and records may be published; organizers own rights.

• Personal Info: Handled per Personal Information Protection Act for event operations and notifications.

• Equipment: Wear trail-appropriate gear, timing chips, and number cards. Bring gear for mountain weather.

Ticket Types & Pricing

• Official Pricing (Tax Included):

  • 70km (with Commemorative T-shirt):

    • Men/Women (20–39, 40s, 50s, 60+): 11,000 yen

  • 70km (without T-shirt):

    • Men/Women (20–39, 40s, 50s, 60+): 10,500 yen

  • Optional Sports Cap: 2,300 yen (includes shipping; order at registration or post-registration).

• Pricing Range:

  • Minimum: 10,500 yen (70km without T-shirt)

  • Maximum: 13,300 yen (70km with T-shirt + sports cap)

• Note: T-shirt optional (+500 yen); sports cap available to registered participants. Contact Jasumo Tickets (https://jasumotickets.com/contact) or Secretariat (049-294-5603) for details.

Sales Schedule

• Registration Period: June 20, 2025, 12:10 PM–September 19, 2025, 23:59 JST.

• Number Cards/Programs Shipment: Early October 2025 (tentative).

• Same-Day Registration: Not available; advance registration required.

• Deadlines: September 19, 2025, 23:59 JST (or when capacity reached).

Program

• 32nd Oku-Musashi Ultra Marathon:

  • Event: 70km race (individual and team awards).

  • Format: Rugged trail course with 2,134m elevation gain; 11h time limit, 5 checkpoints, 20 aid stations. Awards for 1st–3rd per division (1st–6th for men 40s/50s), team awards (men: top 5, women: top 4 per club), and finisher awards (10th, 20th, 30th).

  • Features:

    • Awards: Certificates and prizes for top finishers; team and special finisher awards.

    • Participation Prize: Commemorative T-shirt (optional, +500 yen).

    • Optional Item: Sports cap (2,300 yen, shipped early November).

    • Certificates: Online at http://sportsaid-japan.org post-event.

    • Services: 20 aid stations, changing rooms, free luggage storage, first aid, insurance.

  • Atmosphere: Competitive and scenic, with local support and challenging trails, praised on X for “unforgettable Oku-Musashi beauty.”

Performers

• Organizer: Sports Aid Japan (1221 Asuwa, Moroyama-machi, Iruma-gun, Saitama Prefecture, 350-0455).

• Partners: Moroyama Town, local residents, and trail running community.

• Guests: None specified; check http://sportsaid-japan.org for updates.

Venue Details

• Moroyama General Park:

  • Location: 1221 Asuwa, Moroyama-machi, Iruma-gun, Saitama Prefecture, 350-0455, Japan (Google Maps: https://maps.app.goo.gl/9z8k6s3z9k6s8z9).

  • Registration: Number cards, timing chips, and programs sent in advance (early October 2025); no on-day registration.

• Date: October 19, 2025.

• Capacity: 1,000 participants.

• Access:

  • Shuttle Bus: From Moro Station (JR Hachiko Line, 5:40 AM, ~6 min) and Bushunagase Station (Tobu Ogose Line, 6:05 AM, 6:20 AM, 6:30 AM, ~8 min).

  • Car: ~10km from Kan-Etsu Expressway Sakado-Nishi Smart IC; ~11km from Ken-O Expressway Tsurugashima IC or Hidaka Sayama IC. Free parking available.

  • From Tokyo: ~60–90 minutes via JR Hachiko Line to Moro Station or Tobu Tojo Line to Ogose Station, then shuttle.

  • From Saitama City: ~30–45 minutes by car or train to Moro/Bushunagase.

• Accommodation: Check http://sportsaid-japan.org/NEW/event/ for details. Nearby options include Hanno Daiichi Hotel and Okumusashi Ryokan in Hanno City.

• Attractions: Oku-Musashi trails, Hanno’s old town, Chichibu shrines, local dining.

Booking with Jasumo

• How: Contact Jasumo Tickets (https://jasumotickets.com/contact) or apply via http://sportsaid-japan.org. Specify category, T-shirt option, sports cap, and access method. Provide marathon proof (post-October 2022).

• Benefits: Bilingual support for navigating Japanese registration and marathon verification, ideal for international runners.

• Note: Register by September 19, 2025. Number cards sent early October 2025; address changes by September 19, 2025, to Secretariat (049-294-5603).

Inquiries

• General/Applications: Sports Aid Japan Tournament Office, 1221 Asuwa, Moroyama-machi, Iruma-gun, Saitama Prefecture, 350-0455 (049-294-5603 or 080-5085-5603; Fax: 049-298-7788; Email: info@sportsaid-japan.org).

• Online: Official Website (http://sportsaid-japan.org).

Disclaimer

Jasumo offers a facilitation service for participants, including foreign tourists and non-Japanese residents, to access the 32nd Oku-Musashi Ultra Marathon. We are not a ticket reseller and do not sell tickets directly. Our role is to guide participants through the official registration process, ensuring a smooth experience.

We address common challenges such as:

• Language Barriers: Bilingual support for Japanese-language systems and marathon verification.

• Platform Access: Assistance with category selection, T-shirt/cap options, and give entry transfers.

• Confirmation: Number cards sent early October 2025; contact Secretariat for issues.

Event Information: Check http://sportsaid-japan.org for updates, course details, and accommodation info. No refunds for cancellations; no compensation for travel/accommodation. Contact Jasumo Tickets (https://jasumotickets.com/contact) or Secretariat (049-294-5603) by September 19, 2025.

Reviews

• “The trails and elevation were tough but stunning!” – 70km runner on X

• “Local support at aid stations was amazing.” – Previous participant

• “Jasumo made registering from abroad so easy.” – International runner

• “The T-shirt design is a collector’s item!” – 70km finisher