In the past 36 years, only 15 people have finished the race. This is a documentary about one man who continues to challenge the devil's race.

One of the most coveted titles for trail running enthusiasts is "100 miler," a special title given to those who have completed 100 miles, or 160 km, of racing. Professional trail runner Tomokazu Ihara, a.k.a. TOMO, has set a goal to complete 100 such 100-mile races in his lifetime.

Even TOMO, who has already completed nearly 70 marathons and boasts overwhelming experience and running ability, has yet to finish the "Berkeley Marathons," dubbed the "devil's race," after three attempts.

Entry requirements and entry details are undisclosed, and although there are fewer than 40 participants each year, only 15 have finished the race in the past 36 years, making this race a mystery. The venue is Frozen Head State Park in Tennessee, USA, and the course is a five-lap loop of approximately 32 km, with no navigation whatsoever. There is even a strange rule that requires runners to find a book hidden on the course and cut out the page with their bib number, preventing them from finishing the race.

The documentary film "TOMO" follows Mr. TOMO's fourth attempt to complete the Berkeley Marathons.Main Quest ~Guided by the Berkeley Marathonsis available on vimeo.

With rare local footage of the devil's preparation for the race, his mindset, his feelings just before the race, and the reasons why some of the world's best trail runners participate, you will witness a part of the Berkeley Marathons through one man's challenge.

Why are people so fascinated by the primitive act of running? Get a sense of the reasons from the extreme challenges of the drunken fiercest of the fiercest.