List of gaming companies located East of Sekigahara, Gifu-ken, Japan. From Gifu-ken and Mie-ken to Hokkaido. The order of the textual information is: chihō/region and ken/prefecture, company name (in bold) and my comments. There is also some silly gossipy information and comments I have written, but please skip over them. Too many companies are located in the 23 wards of Tokyo to be excluded from the East Japan version of the list. The game titles were chosen at my own discretion, as I consider them to be representative of the target game company. So, if you have any objections, please give your opinion in the comments section.

Map of all Japan: simplified ver1, simplified ver2, Tokyo-to Map
Note1: 地方/chihō = region, 都/to = capital city/metropolis, 府/fu = prefecture, 県/ken = prefecture, 市/shi = city, 区/ku = ward
Note2: Games not registered with the IGDB, publisher companies, port development, some development support, and game companies that only make chess/mahjong/smartphone games and educational games were excluded.
Note3: When the list was initially drawn up, the intention was to exclude eroge/adult game companies. But then I thought, "What the hell are Enix, Nihon Falcom and Koei in the early days?" and so it was decided to include eroge-companies in the list. In addition, only eroge-companies that had all-ages ports and known addresses were included in the list.
PS: It was the most typed article on the word chihō in my life so far. Pokémon or Kemono Friends. たーのしー！くない。