After walking about 15 min., we got to the Fuji Wind Cave (Fuji Fuketsu). This is the stone marker for it.

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Filename:	ya413-20191112_2237.jpg
Album name:	philbert / Aokigahara Forest and Lava Tube 青木ヶ原樹海・風穴
Keywords:	yamanashi / fujikawaguchiko / aokigahara / forest
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There's no "wind" in the cave. It's just a name. 富士風穴 (ふじふうけつ)