Quote from
https://www.sakuramobile.jp/japan-wifi...
Third and fourth generation (3G and 4G respectively) networks are available in Japan, so a phone that can access these networks will work here.
I.e. the Huawei E5573 should work in principle.
The question is, of course, which SIM card you want to use.
I would check the costs quite carefully beforehand if you are travelling with a Swiss SIM.
If in doubt, it would probably be advisable to buy a Japanese prepaid SIM.