City buses from Fuji Heavy Industries, Japan.jpg

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(Photo source: Wikipedia / Free distribution license image, original author Kitakyushuhamojiko)

(Photo source: Wikipedia / Free distribution license image, original author Wakkubox)

(Photo source: Wikipedia / Free distribution license image, original author Yamato-i)

(Photo source: Wikipedia / Free distribution license image, original author Jun Nishiseko)

(Photo source: Wikipedia / Free distribution license image, original author Cassiopeia sweet)

(Photo source: Wikipedia / Free distribution license image, original author Rebirth10)
These are buses manufactured at the Fuji Heavy Industries factory in Isesaki City, Gunma Prefecture. Since 2003,
Fuji Heavy Industries has no longer produced bus bodies, but in the past, there were custom body manufacturing companies represented by Fuji Heavy Industries and West Japan Body Co., Ltd. (NSK, a Nishitetsu
subsidiary). The method involved purchasing city bus chassis and engines from finished vehicle manufacturers such as Nissan Diesel, Isuzu, Hino,
and Mitsubishi Fuso, and then having Fuji Heavy Industries custom-build a body to meet the specific preferences of the bus operator to mount onto the chassis. Since existing finished vehicle manufacturers
could not satisfy all the diverse requirements of various bus companies (window size and number,
body length, interior facilities, etc.), bus body manufacturing plants like Fuji Heavy Industries would manufacture custom bodies according to these requirements and deliver the completed buses by mounting the body onto the finished vehicle manufacturer's chassis. Currently, vehicles with standardized designs/engineering from finished vehicle
manufacturers (J-Bus, a joint venture between Isuzu and Hino, and Fuso) are the mainstream, but in the past, it seems there was a very wide variety of city bus models.