This is Odakyu Sightseeing Service Center. Thank you for your email.
For more detailed information about Fuji-Hakone Free Pass, please refer to the following URL: http://www.odakyu.jp/english/deels/freepass/fujihakone/
Please be noted that the round trip ticket included in the Fuji-Hakone Pass means either one option of the following:
1. Going by Train (From Shinjuku to Hakone Yumoto) and Return by Bus (From Kawaguchiko Station, Fuji-Q Highland or Fuji-Yoshida Station to Shinjuku)
2. Going by Bus (From Shinjuku to Kawaguchiko Station/Fuji-Q Highland/Mt.Fuji Station) and Return by Train (Form Hakone Yumoto to Shinjuku)
Please choose either of the above options and tell us whether you would like to (go by train return by bus) OR (go by bus return by train).
The train ticket included in the Fuji-Hakone Pass, which goes between Shinjuku and Hakone Yumoto, is a regular train ticket. You may upgrade this train ticket to the Limited Express Romance Car Ticket. For more details about the Romance Car, please refer to the following URL: http://www.odakyu.jp/english/romancecar/
The differences between regular train and Romance Car are as follows: