Inclusion Criteria:  Japanese citizen Healthy adults aged ≥20 and <65 years, or healthy elderly aged ≥65 and <75 years (at the time of informed consent) Body Mass Index (BMI) is ≥17.5 and <30.0 kg/m^2 (at screening) Participants who can follow the compliance requirements during clinical trials, undergo medical examinations and tests specified by the protocol, and report symptoms, etc.  Exclusion Criteria:  Have a history of immunodeficiency or having a close relative with congenital immunodeficiency. Have a history of SARS-CoV-2 infection. Have previously participated in an investigational study of SARS-Cov-2 vaccine or involving LNPs. Have a history of anaphylaxis or severe allergies due to food, cosmetics, medicines, or vaccination Have alcohol or drug dependence. Have a fever of ≥39.0°C or symptoms of suspected allergies such as systemic rash within 2 days after past vaccination, etc.