Root Letter is set in Matsue, Shimane, and its backdrops copy real places: the Shimane Art Museum, the Kyomise shopping street, Lake Shinji, Yaegaki Shrine and Matsue Castle.
A man travels to Matsue to find Fumino Aya, a pen pal who vanished 15 years earlier, and questions her old classmates one by one. The route follows five real places that the game turns into scenes, from the lakeside city to a shrine tied to the Yamata-no-Orochi legend. The game's order of visits is not documented, so the stops are a sequence, not a timetable.
In May 1804 William Clark and about 30 others left a winter camp on the Mississippi and turned up the Missouri, the first stage of an expedition sent to cross the newly acquired western part of the country. Captains Meriwether Lewis and Clark kept journals, and many of their entries are quoted here in their own spelling.
The route follows them from Camp Dubois past a sergeant's grave, a tense standoff with the Teton Sioux, a winter at Fort Mandan, the Great Falls, the Continental Divide and the snowbound Lolo Trail to the Pacific, then home by way of Clark's signature on Pompeys Pillar. Where a camp is lost to the river or to time, the pin marks the nearest place you can visit.
