In the second prominent area (east of the entrance) by the Tanuki Boulder.
From the Behemoth Boulder go east along the ridge until you descend into a new boulder field.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Big Size Boulder:
Big Size V9-10 Boulder
Featured Route For Big Size Boulder
Big Size V9-10 International : Japan : ... : Big Size Boulder
Start with your left hand on the big flat edge on the arete and your right on the crimpy, slopey undercling just above it (crossed). Move up left to the crimps on the face and right slapping up the arete. Do what you can to top out....[more] Browse More Classics in International