A special QR code for the LINE Shop Card is posted in the store; each time you read the QR code, you will receive one stamp on your LINE Shop Card.
There is a limit of once per day per visit, but if you accumulate enough for 10 visits, you will receive one free bowl of tsukemen, ramen, aburasoba, or whatever.
This present will be limited to the main store in Shinjuku 6-chome.