Kampo is a Japanese traditional medicine that is based on information contained in an ancient Chinese classic. A Kampo formulation has numerous medicinal properties and is effective for many symptoms. This makes Kampo suitable for treating long COVID, which has various symptoms. We look at how Kampo formulations are prescribed, through one patient who was cured. We also introduce the latest scientific findings on how Kampo can prevent depressive symptoms, and how it can prevent coronavirus infection itself.