The number of academic web services are increasing every year. Don't you have any trouble remembering all the ID's? GakuNin will take care it for you. The Academic Access Management Federation in Japan (GakuNin) is a federation consisting of universities, who are users of academic e-resources, and organizations like publishers, who are providers of such e-resources. By mutually trusting rules/policy stipulated by the Federation, organizations will be able to utilize federated access between each other. Your institution may be already a member of GakuNin. Check the following list.