All Digital Editions of the Manga Have Been Delisted as of 2019

(from ebookjapan):
This is an adventure story of 6-tan and 6kko (read as Rokutan and Rokko) who travel around the U.S. and the U.K. alone to meet their uncle. In addition to the title story, there are "SHO-chan's Round the World in 70 Days" and "Shosuke-kun's Trip to Europe," travel essay manga drawn in the era when overseas travel was a dream of the common people at 360 yen to the dollar; "Time Travel to Venus in 2500 Years," "Has the Continent Shifted? 200X Year of Earth Crisis," "The Adventures of the Bragging Man Shaku," and the children's gags "Mole Mogu-chan" and "Ninja Animaru."