You can see it on the AnswerNet.
＜How to find "Procedures upon Loss of Participant Eligibility due to Resignation or Related Reasons"＞
Log in to the AnswerNet ＞ Click on "Request Forms" in the upper right corner of the screen
Please refer to the PDF file under "Procedures for changing jobs and retirement" in the "Reference Materials for Applications" of the "Materials for Reference" section.