How can I get japan refugee visa

We would like to inform you that there is no refugee visas and multiple visas can be granted such as tourist visa, visit, student, and investor for one trip or several trips.
But if you mean asylum by obtaining a visa, you can go to the embassy and apply for the visa with the following documents:
1- The passport, provided that it is valid for at least six months.
2- Clear personal photos, such as a passport-sized one.
3- Submit a bank statement showing the movement of the account for the last three months to ensure the expenses in case of travel. This requirement may be skipped with the presence of the invitation letter.
4- Providing return flight ticket.
5- Submit the hotel booking. This requirement may be skipped with the presence of the invitation letter.
6- Submit a health insurance policy.
7- Providing residence, provided that it is valid for no less than three months, in addition to the sponsor’s approval if you are an expatriate.
*** Then pay the fees determined for the visa, which the embassy estimates at the time. And it is the embassy’s decision whether to accept to grant you the visa or not.