This might be one of the most complex stories here, so strap your buckles, frienderino.
In Japan, the popular farming series known as Bokujō Monogatari (literally translated as "Farm Story") has always been published in that country by Marvelous (or their precursor companies - believe me, there's A LOT of acquisitions, merges and business mumbo-jumbo in this series history).
However, in North America, it was published by Natsume Inc under the "Harvest Moon" name. This was a fruitful and long-lasting relationship, releasing 24 games, until, in 2014, Marvelous decided to publish the series themselves through their subsidiary X-SEED (now Marvelous USA).
However, Natsume Inc. still owned the "Harvest Moon" name, and thus Bokujo Monogatari became "Story of Seasons" in the west, while Natsume began developing their own farming games, confusingly keeping the name "Harvest Moon".
So now we have "Story of Seasons", a series that includes 24 games called "Harvest Moon", and "Harvest Moon", another farming series from completely different developers than those 24 previous Harvest Moon games.
The game mentioned, 2014's Story of Seasons for the 3DS, known in Japan as "Bokujō Monogatari: Tsunagaru Shin Tenchi" (literally "Farm Story: Linking the New World"), was the first game published under the "Story of Seasons" name, and the 25th game in the series.