To log in to your "My Sakura Mobile Account," please proceed to the following link and enter your email address which is registered to your Sakura Mobile account and your password for your My Sakura Account. 

https://myaccount.sakuramobile.jp/auth/login

※If this is your first time logging into your Sakura Mobile Portal account, please use the following link to set your password.

https://myaccount.sakuramobile.jp/auth/password_reset