From an international anime fan perspective, Hotaru Okamoto and Yuko Tone's manga Omohide Poro Poro or Only Yesterday is best known as the inspiration for a 1991 anime movie by Studio Ghibli co-founder Isao Takahata's (Grave of Fireflies, Pom Poko, My Neighbor the Yamada). In turn, that anime movie is known for being unknown in North America, as apart from their latest, it's the only Studio Ghibli theatrical movie not released in the region. (Ghibli's TV movie Ocean Waves is missing too.) That's despite the movie being dubbed, airing on Turner Classic Movies' 2006 Ghibli retrospective and being scheduled for a DVD before Disney reshuffled their Ghibli DVD release plans.
The Ghibli Blog notes that the original manga is now available, at least in Spain, on the Apple's iOS platform in untranslated Japanese.
The semi-autobiographical Omohide Poro Poro follows a 27 year old woman who revisits her childhood as she breaks from her busy Tokyo based life to travel to a rural harvest.