Quick PSA. If, for whatever reason, you missed your connecting flight just remember one thing. Tokyo has two international airports.
My initial flight was delayed so I missed my connecting flight to Haneda from Singapore. While the next flight was in 7 hours there was one to Narita in just 2 and since it's the same airline they can re-book you in seconds.
Also if there is a delay and your new flight arrives after 10PM make sure to ask for a cab ride home voucher from your airline as compensation, more so if you're landing in Narita, it's an expensive ride and you are entitled to it if the airline is at fault. They just won't give it to you unless you actually ask.
by Kidlike101