You only need to pay tuition fees to RU; it is not necessary to pay tuition fees to ANU. In addition, invoices for tuition fees will be sent to the 'Tuition Billing Address' and will not be sent overseas. If tuition fees are not paid by the due date, the student will under any cicumstance be "expelled" from the university and will not be able to continue their studies. Furthermore, SSAF (Services & amenities fee) must be paid separately to ANU, hence please follow the instruction by the ANU.
Regarding RU tuition payment
https://www.ritsumei.ac.jp/tuitionfees