Japan exclusive offer
From my understanding contest like this are illegal in the US but are not illegal in the UD from what I have been told.
For those that want more info, basically you have to buy a Steam key from Komodo (well not directly from) in order to be able to participate in the contest. 7 512GB Steam Decks are being given away, with the option to choose to get a Steam deck or the signed jackets, you have to choose which contest to enter, it's one or the other that you can enter to win.
By the way the RRG team was at the Steam Deck TGS booth to promote Ishin.
PS Komodos' sister company is in charge of those Steam cards. So they make money off them.
In Japan Komodos' sister company sells these cards to retail stores , which is why Japan 711 is promoting this promotion since you can buy these cards at a 711. The thing about these cards is that unlike a regular steam gift card, these cards are locked to one game only. And it tells you on the card that you are buying. Nintendo does something similar in Japan (I'm not sure if Sony does the same thing or not)
I believe that Capcom also did a pro in the past with similar Steam game cards sold at physical retail stores (you could always import one via Amazon.jp if you wanted)