You can download "Account Holder Change Request Form" from here to change the account holder due to the death of the account holder or other reasons. Please fill out the required information and mail it to the address below.
Ambit Energy Japan, GK.
Hankyu Grand Bld. 20F, 8-47 Kakuda-cho, Kita-ku Osaka, Japan, 530-0017
In the event of the death of the account holder, enclose an official document certifying the death of the account holder (such as a copy of deleted residence record, family register with description of removal, or death registration).
If you would like to add an authorized user to the account, please complete the “Additional Contact Person Registration Form” by downloading from here and mail it along with the “Account Holder Change Request Form”. See also "I would like to add a contact person." for more details.