A form for climbing plan which we are supposed to submit to Fujiyoshida Police Station before climbing the mountain outside the official season.

An online form is also available though it's only in Japanese.
https://www.pref.yamanashi.jp/police/formmail/tiiki.htm

A photo blog by Andy Gray about his second climbing of Mount Fuji, this time from Subashiri Trail.
The pictures are incredibly beautiful.

Introduces a story of a nurse who made a vacation trip to Japan.
"... But the most daring, exciting trip she's taken was climbing Mount Fuji in Japan with her 19-year old daughter, Barbara, in tow, upon Barbara's graduation from high school. Barbara had become fascinated by all things Japanese, and her mother had promised her a trip to Japan if she made the honor roll. ..."

An introduction to Mt. Fuji climbing written by a man who climbed to the summit 17 times.
I found "Winter Climbing Recommendations and Precautions" particularly useful. He introduces what the signboard at the 5th station of Kawaguchiko Trail actually says with his additional explanation.

A report of hiking Mount Fuji by a math teacher.
He describes Fujiyoshida/Kawaguchiko Trail with lots of pictures along the trail, and even shows elapsed time at each point.