It was established on 1 October 2003[1] to inherit all business of the Keisei Electric Railway bus department.

This pass[note 1] provides passengers unlimited use of all Keisei Bus and Keisei Town Bus buses in Tokyo, including 金61[note 2] in Saitama, as well as Arakawa City and Sumida City community buses.

[note 3] Over time, bus routes with low usage were discontinued or unified, and bus routes within Narutō were established around Narutō Station and Chiba Station by a community-based company.

The Chiba Rainbow Bus Co., Ltd. (ちばレインボバス株式会社, Chiba Reinbo Basu Kabushiki-gaisha) is a bus company that demerged from the Funabashi Office (Funao Garage) and the Matsudo Office (Shiroi Garage).

This company was established on 9 February 2000, and started operating bus routes transferred from Keisei Electric Railway on 16 July 2000.

When departing from Kajibashi Parking, board the buses 20 minutes prior to departure.

However, for early morning and the late evening buses, fares are paid with cash or IC Card when boarding the bus.