Originally released to the Japanese mobile phone market as Final Fantasy IV the After: Tsuki no Kikan, the first two installments of the episodic game were released in Japan on February 18, 2008 for NTT DoCoMoFOMA 903i compatible phones, with the Prologue available as a free preview and Ceodore's Tale as a paid download. A series of eight supplemental installments were then released in monthly intervals through September. This was followed in October by a free semifinal installment, The Gathering's Tale, which required only that the player have completed the supplemental Kain's Tale. The game's finale was released in two parts in November and December. Square Enix also began releasing the installments, with a delay, for au WIN BREW compatible phones beginning on May 15, 2008 and Yahoo! Keitai compatible phones on November 4, 2008 (a complete list of compatible phone models is available on the official Japanese website).
On August 1, 2008, Square Enix issued a press release announcing that Final Fantasy IV: The After Years had reached a benchmark of one million downloads (not including downloads of the free prologue chapter) in the first five months following its initial release. As of March 25, 2009, it has exceeded three million paid downloads.
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