In search of the sea scenery that inspired the name "Umi" given by her now-deceased parents, Nanase Umi embarks on her first solo overseas trip. Together with a painter girl named Andou Rie, whom she meets in Portugal, they travel the world in pursuit of "the sea." What will the two encounter along the way...? Volume 1 takes you through three countries: Portugal, Spain, and Italy! Would you like to travel the world with us?