Some publishers require authors to pay APC (Article Processing Charge) if they wish to arrange their articles for open access.
Members of University of Tsukuba may be able to receive waivers or discounts of APC based on the contract and subscription of University of Tsukuba. For more information, please refer to the following site.

Services > Disseminate Your Research Outputs to the World! > Article Processing Charge (APC) Waivers and Discounts
https://www.tulips.tsukuba.ac.jp/lib/en/service/apc