NifMo by Nifty is a Japanese MVNO that provides data-only and voice+data SIM cards on contract, starting from six months. NifMo uses the NTT DoCoMo network.
If you need a new phone with your contract SIM, you can purchase one through NifMo. In terms of data, you can choose from 3GB, 7GB and 13GB packages. Family-sharing plans are also available. The level of English-language support available from NifMo is unclear; intermediate or advanced Japanese-language ability is recommended.
Note: Before you are able to use your NifMo SIM, you will need to configure the APN settings-instructions will be provided on how to do that.
See how NifMo compares to other long-term mobile options in Japan.