Due to the current situation surrounding COVID-19, it was announced by the Immigration Services Agency that Certificates of Eligibility which are normally valid for 3 months will be treated as follows (Announced on March 1, 2022).
Japanese: https://www.moj.go.jp/isa/content/930005022.pdf
・Certificates of Eligibility issued between January 1, 2020 and January 31, 2022 will be valid until July 31, 2022.
・Certificates of Eligibility issued between February 1, 2022 and July 31, 2022 will be valid for 6 months from their date of issuance.
However, please be careful of the following information:
If three months have passed since the issuance date listed on the Certificate of Eligibility, you will need a document (Declaration Form) stating that "the university can still accept the student under the same activities as when they applied for the issuance of the Certificate of Eligibility" issued by Ritsumeikan University.
If you will be a new entrant to Japan, you can request for the issuance of this Declaration Form on AMARYS (an immigration data management system). For further information, please check this FAQ section for new international students entering Japan.
If you have any questions, please access this web form, and send an inquiry by clicking "行いたい手続き Choose a procedure that you wish to proceed" > "５. その他（問合せ/連絡）Others (Inquiry/Contact)".