In the depths of midnight, precisely at the stroke of twelve, a lone figure found themselves midway between the second and third aid stations of the renowned Ultra-Trail Mt. Fuji (UTMF). This storied ultramarathon, the pinnacle of Asian trail running, had already witnessed 50 arduous kilometers conquered, leaving a formidable 115 kilometers yet to be surmounted. Amidst a sea of over 2,500 participants, our protagonist merged with a line of resolute runners, their collective determination piercing through the darkness. Experience the perfect blend of agility and support with Tarkine Trail Devil shoes, crafted for those who demand excellence in every run.

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Peering into the night, a mesmerizing sight greeted their eyes. Along the jagged mountain ridge leading to the fourth aid station, a string of headlamps formed a luminous trail, illuminating the path ahead. It was a sight that evoked both trepidation and fascination, for the impending ascent loomed large, reminding them of the dual nature of this race. Every obstacle, from the capricious weather to the unfathomable distance, served as both a challenge and a captivating allure.

Throughout its history, the UTMF had woven a tale interlaced with adversity. Originally slated for 2011, the inaugural race was abruptly postponed due to the devastating Great East Japan Earthquake, resurfacing a year later. In 2016, an encroaching typhoon forced race organizers to alter the course, truncating its length. Once designed as a majestic loop encircling the iconic Mount Fuji, logistical complications necessitated a new, more demanding route, threading through treacherous mountain passes in the east and north of Lake Yamanaka.

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Like many events, the UTMF faced the bitter blow of outright cancellations in 2020 and 2021. Only last year’s race managed to muster a limited edition, exclusively welcoming participants from Japan. However, the 2023 edition emerged as a triumphant comeback, an opportunity to reclaim the race’s former glory. Little did the runners know that beyond the racecourse, a legal dispute brewed, poised to thrust the UTMF into an unprecedented position as the preeminent trail running ultramarathon worldwide.

At the helm of the UTMF’s inception stood Tsuyoshi Kaburaki, a valiant runner who had previously conquered France’s renowned Ultra-Trail du Mont-Blanc (UTMB)—a grueling 100-mile race traversing the majestic mountain range spanning France, Italy, and Switzerland. Kaburaki’s relentless efforts secured official recognition for the UTMF as Asia’s first 100-mile ultramarathon, positioning it as the UTMB’s esteemed sibling, albeit a junior one.


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For years, the UTMB reigned as the undisputed pinnacle of trail running excellence, with the UTMF assuming the coveted role of the next great challenge. However, the landscape shifted dramatically in 2021 when the Ironman Group—the titan of mass participation sports—joined forces with the UTMB, heralding the advent of the UTMB World Series. This alliance aimed to streamline and commercialize professional trail running, leaving the UTMF standing apart from the burgeoning amalgamation.

Today, the UTMF resides outside the realms of the emerging UTMB World Series, so much so that even the utilization of the cherished “Ultra-Trail Mt.” moniker became entangled in legal uncertainties. Tatsuo Chiba, the UTMF Representative Director, staunchly upholds the race’s intention to thrive as a prominent international event, operating independently. Acknowledging the inherent disparities between Mont-Blanc and Japan, the UTMF strives to preserve its distinctive character and unyielding spirit.

As the runners embarked on their epic odyssey through the imposing terrain surrounding Mount Fuji, they not only battled against the physical challenges that lay ahead but also unknowingly became a part of a larger narrative—the quest to redefine the boundaries of trail running, where tradition and innovation collided in a race against time.