The only visa attendance at ARC Academy qualifies students to apply for is the student visa.
This depends on the period of study and your nationality.
For a short period of time, shorter than 3 months, and depending on your nationality, you can come to Japan without any preceding formalities. Please see here for more information. Ministry of Foreign Affairs.
If you will be studying for a long period of time, more than one year, you can apply for student visa.
You cannot change the visa status immediately. Application and procedures for student visa takes about 6 months.