You can change plans.
However, when changing plans, there are some things you need to be careful. Please see below.
When you want to upgrade plan if you are a year contractor
If you want to upgrade it in the middle of the year contract, you must pay remaining month's fee in difference.
Business Light Plan：9800 yen/month（price for year contract）
Business Plan：15800 yen/month（price for year contract）
You must pay the difference per month 10,000 yen × 4 months 40,000 yen in addition.
If you want to downgrade plan if you are a year contractor
If you are a year contractor, you cannot downgrade plans. Please be mindful of that.
If you want to change plan when you are a monthly contractor
If you are paying with a credit card, you can change plan from the plan button.