Whether or not you use an agency is entirely up to you. Most students apply on their own, but if you are unsure about applying on you own or can afford the cost by yourself, using an agency is an option. You can either find an agency yourself or use the agency below.
RU provides the following agency. If you wish to use the agency, please contact them directly at least three months before your departure date. Please note that if you contact them less than three months before your departure date, they may not be able to accept your request. In addition, please be aware that some countries, regions and nationalities may require you to apply independently.
JACC Overseas Corporation
Website: https://www.jaccvisa.co.jp/index.html
email: visa@jaccvisa.co.jp