Corona Emergency loan provided by JFC (semi-governmental financial institution) is now available. The conditions are:
The revenue has been dropped by more than 5%. If the company is new (less than 1 year, the base will be December revenue or the average of the last 3 months).
Interest will be very low. The government says it will be substantially nill but the details are not clear yet.
If you meet certain criteria, the interest will be nil for the first 3 years.
More details are available on this page.
https://www.jfc.go.jp/n/finance/search/covid_19_m.html
Let us know if you need more information.