For your needs, we would like to recommend the account hibernation service. Regulation of hibernation service:

For each month of hibernation, you will need to pay 550 yen/month.
The reservation period must be from the first day of the beginning month to the last day of the ending month. You will not be able to start the hibernation service in the middle of the month.Example:Hibernation period from January 1 ~ March 31: ACCEPTHibernation period from January 20 to March 20: REJECT
About hibernation fee:If you make a reservation request and complete your payment before the 23rd, the hibernation service will start from the following month.If you make a reservation request and complete your payment after the 24th, the hibernation service will have to start from the month after the following month.
About monthly fee:If you complete the monthly payment issued on the 25th before the reservation month begins, the service will automatically reactivate on the first day of the activation month.If your flight departures before the date of monthly invoice issuance and you cannot pay, this fee will rollover to the month of service activation. Thus, you will need to complete this payment when you return to Japan to reactivate the service before the due date.

 If you agree with the above conditions, please contact our Customer Support Center with your registered email address so that we can proceed with your request.