As a general rule, we send the notification to the contract holder of the main line.
As far as "Omatome Seikyu Service (combined billing method)" goes, we won't send the notification to the contract holder of sub-lines even if the contract holders of sub-lines are different from that of the main line.
When the contract holder of the main line applies for "Omatome Seikyu Service," we process the application based on the premise of that he/she has agreements with all sub-lines' contract holders.