Atria LLC (Headquarters: Osaka City, Yodogawa Ward; Representative Members: Satoshi Hamasaki, Touma Tagami), which operates the island-specialty media "Hanarejima Public Relations," has collaborated with "Map Design GALLERY," a brand operated by Zenrin Co., Ltd. (Headquarters: Kitakyushu City, Fukuoka Prefecture; President: Michio Takekawa) that sells stationery and miscellaneous goods designed with maps. As a joint initiative leveraging the strengths of both parties, we are pleased to announce the production of a rulebook for "Map Design GALLERY CARD/Inhabited Islands," a trading card series specializing in remote islands, which will be distributed starting July 3, 2026 (Fri). Rulebook Produced for "Shimac Jack," a Game Devised by Hanarejima Public Relations The collaboration between the two entities has resulted in the creation of the rulebook for "Shimac Jack," an original game devised by Hanarejima Public Relations that can be played using "Map Design GALLERY CARD/Inhabited Islands." "Shimac Jack" is a "Island Blackjack" where players aim to get as close as possible to "417," the number of inhabited islands in Japan, by guessing the population density depicted on each card. Players can analyze the topography or leave it to luck. It's a game that can be easily enjoyed by both island enthusiasts and beginners. The rulebook will be included with the target product, and a web version can also be viewed from the article. "Shimac Jack" Web Rulebook Furthermore, Hanarejima Public Relations is sharing new ways to enjoy island trading cards, including publishing an article about playing "Shimac Jack" with the Zenrin team. Please enjoy the report on the heated battles in the article. ▲ (Related Article) Heated! We Played the Original Game with the Developers of Island Trading Cards ▲ (Related Article) Too Niche! An Interview with the Developer of Island Trading Cards About "Map Design GALLERY CARD/Inhabited Islands" This is a trading card series themed around inhabited re