The Aokigahara Forest is located to the north of Mount Fuji, which grew over the lava bedrock following the volcano's last major eruption in the 9th century. The dense forest is known as the "Sea of Trees" given the quiet and sparse territory found here. A number of caves, like the Narusawa Ice Cave and Fugaku Wind Cave, can also be found here.
Aokigahara Forest has an unfortunate reputation as a destination for those facing struggle — if this describes you, please consider talking to someone. This is not a recommended tourist destination for those seeking macabre delights.
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The nearest station is Kawaguchiko Station on the Fuji Kyuko Line (around 2 hours from Tokyo).
From there it is a 30 minute drive west along Route 139 and 71.
The Narusawa Ice Cave is a lava tube located in the Aokigahara forest, in the part that belongs to Narusawa Village, Yamanashi Prefecture, Japan. It is one of the three larger lava tubes at the northern foot of Mount Fuji, the other two caves being Fugaku Wind Cave and Lake Sai Bat Cave. [Wikipedia]