The Kogen-numa course is a quagmire.

The Kogen-numa course has many puddles and muddy areas on the trail due to rain and snow that fell continuously for several days. The trail will prove very slippery to people wearing low shoes. Even just walking normally is extremely difficult.
Such muddy conditions will likely remain for several days even in good weather. Accordingly, long boots, spats, and other such equipment will be needed when taking the course.
Photos: The trail near Midori-numa Sep. 20