After very busy day I managed to complete my work, submit time report and be out of the office by 16:05. I ran to the Futakotamagawa train station, ran to change train in Jiyugaoka and ran 500 m to reach the Narita Express platform at the Musashi-Kosugi station 4 min before departure. Phew. That was close.
Chie join me on Narita Express from Shinagawa station. So now we are both on our way to Kauai.