PlayStation 4 sold very well during its Japanese debut -- 322,000 consoles were sold in 48 hours -- but its software sales seem to be soft, at least at retail.

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3.) Yakuza: Ishin (82,540)

(82,540) 7.) Killzone: Shadow Fall (32,336)

(32,336) 8.) Battlefield 4 (24,799)

(24,799) 11.) Dynasty Warriors 8: Xtreme Legends (14,356)

(14,356) 13.) Assassin’s Creed IV: Black Flag (13,862)

(13,862) 14.) Call of Duty: Ghosts (13,701)

(13,701) 15.) Tomb Raider: Definitive Edition (12,093)

(12,093) 18.) FIFA 14 (8,808)

(8,808) 20.) Need For Speed Rivals (6,602)

Japanese Media Create charts, which are updated every week, show 10 PlayStation 4 games in the Top 20, according to a translated list from Gematsu . But the numbers aren't incredibly impressive.Topping the list is Knack, which sold over 300,000 copies. However, Knack comes with every PlayStation 4 sold in Japan, explaining the one-to-one attach rate. The other nine PS4 games in the top 20 are as follows:The above sales account for just shy of 210,000 games sold at retail, meaning that not everyone who purchased a PlayStation 4 in Japan bought a game. Now, Knack’s inclusion with each PS4 certainly had something to do with that, but there’s definitely more to the story.For starters, the much-anticipated Yakuza: Ishin launched on PlayStation 3 at the same time as PS4, outselling the PS4 iteration by over 55,000 copies (138,158 copies of PS3’s Yakuza: Ishin were sold). And then there’s the rise in digital sales. Like PS Vita’s roster of games, every title sold on PS4 must be available digitally, and those sales are not counted by Media Create.The soft sales of PlayStation 4’s software at retail may be more a sign of the times – of a shift away from brick-and-mortar and towards the inevitable digital future – but it could also be a sign that there’s not a lot of interesting PS4-exclusive software available in Japan right now. Either way, we’ll keep an eye on how things develop for PS4 in Sony’s home country in the coming weeks and months.

Colin Moriarty is IGN’s Senior Editor. You can follow him on Twitter.