The easiest and fastest way is taking the “Wakashio” limited express of JR Keiyo & Sotobo line and get off at “Kazusa Ichinomiya” station. It takes just 60 minutes from Tokyo station.
There are some direct services to Kazusa Ichinomiya station of JR Keiyo line and JR Sobu line rapid service. It takes about 90 minutes from Tokyo station.
*There are two platform areas for Kazusa Ichinomiya at Tokyo station; the underground platform of the JR Keiyo line and the underground platform of the JR Sobu line rapid service. Please be careful both platform areas are located at different places.
*The “Wakashio” limited express departs from the underground platform of the JR Keiyo line.
From Narita airport
Take the rapid train of the JR Narita/Sobu line and transfer at Chiba station to the JR Sotobo line and get off at “Kazusa Ichinomiya” station. It takes about 90 minutes.
From Haneda airport
Take the bus for Tokyo station then take the above same route from Tokyo station.