The game went on to be a minor hit in Japan, selling over 100,000 copies -- and was followed up by a Game Boy version which, thanks to Pokemon's popularity, sold over 300,000, launching the new franchise.
Interesting facts about the launch of the Harvest Moon/Story of Seasons series in Japan. The first game for SNES sold about 100,000 copies. The game that most launched the series, however, was the simpler Game Boy game, which "sold over 300,000, launching the new franchise." This article credits the success of Pokemon in part with the high sales of Story of Seasons.