Kamikakushi 神隠し translates to "hidden by gods." In Japanese folklore it refers to the mysterious disappearance of a person at the hands of spirits.
For an excellent article written by one of the foremost English language scholars on the topic, please see the following article. It is available as a PDF online. Click the citation to access the full-text.
Blacker, Carmen. “Supernatural Abductions in Japanese Folklore.” Asian Folklore Studies Vol. 26, No. 2 (1967): 111–147. Print.
Here are some links to online resources I recommend.