At each Mos Burger store, a service that allows you to refill "Premium Blend Coffee" (250 yen including tax) for 100 yen will start on March 22nd.

Blended coffee for "100 yen refill"
Blended coffee for "100 yen refill"

If you show the receipt at the time of purchase, you can purchase the second cup for 100 yen. Only available on the date of issue at the receipt issuing store. You can also use it if you choose coffee as a set drink. "Premium iced coffee" is not applicable.