Thank you for the detailed response.
I see you are still making the same error as others - "These virtual cards are non-fungible tokens on a decentralized blockchain similar to Open Publish."
Cards are not tokens, and cards are not on the blockchain. Cards are digital assets, but they can't fit inside a token, they can't fit in the blockchain (for a reasonable price with a reasonable blockchain performance and decentralisation).
You have complicated my example, but it is essentially the same - your physical device is the centralised DB now (or you are using two centrlised DBs - device memory and some corporate cloud server together). Assets (cards) are stored inside it. To access them you need a key. In your example key is the token, but at this point - that's not really mandatory, we have many other ways to sell and store keys. But it's an option, yes.
What you have described is just another way to access assets stored in a centralised way and authenticate yourself as a person having access to them.
And you don't "own" your assets (cards), unless of course there is some agreement, likely on the web site or with purchase of that physical device saying that IP rights are transferred to you Name Surname. You are renting your cards based on the good will of Shueisha, and when you say sell cards - that just means Shueisha gratiously allows transferring of some record in their DB from one of their registered users to another. Just as an example - let's say Shueisha uses Tezos bc, user A is a registered customer of Shueicha and "owns" a digital card from them. Can he sell it to whatever random person with a Tezos wallet? Well, no. Unless Shueisha makes allowance for that, but that would be dumb because it will expose asset to everyone (same as today's NFT pictures work).
Everything is stored on Shueisha servers or DRM'ed devices from them. Everything is managed by Shueisha directly or indirectly via coding some physical device which will do it. Tokens are used to access stuff, but they either insecure, or you will need to have additional parallel authentication with card storage to access them.
NFTs are just layers of technical comlications not really adding anything of substance. They make look like it's easy to buy and sell digital stuff, so very popular for speculation, but in reality they are crippled by inability to actually store medium being sold and to transfer any IP rights by itself, without centralised services.