Originally Posted by
Tokyoite
As long as your domestic flight is not delayed, you will make the connection.
Land at HND domestic, and either take the free shuttle or pay to use Keikyu or monorail to get to international terminal in time for your international flight.
???
When you have domestic to international connection, you can get a free ticket for Keikyu or monorail at information counters on 1F or B1F.