I have multiple Zengaku IDs. Can I use all of them in the future?

At the issuance of the NU ID, we implemented a nominal segregation with the Zengaku ID. The information is integrated with the latest Zengaku ID that seems to correspond to the principle status and is associated with the NU ID. The integrated Zengaku ID is used as an authentication ID, but your old information, such as your affiliation, is deleted. The password for the latest integrated Zengaku ID is the only one that is valid. If you do not know your valid password, please contact [us].