Otokojuku's greatest specialty, used to settle disputes between two teams of four. The entrance is the 1,000-year-old ', which leads to the skeleton and corpse littered '. And the end of it is two giant iron balls called the ', which must be rolled up to the summit of Fujiyama. At the check-points, each team chooses one representative to take part in a fight. Whichever surviving side wins in the end is awarded the ' as champion.