My guess would be because of where the clams grew? Cus I think shellfish taste really depends on the environment they come from. Shijimi being brackish water clams myb those came from more muddy water, so like freshwater fish they lean towards earthy than fishy if that makes sense
During the pandemic the duty free store in my city closed down indefinitely, but they open a couple of times for private sale which I happened to be invited to. I got a Burberry coat for 85% off at around $350. At that price I can't not buy them. Even when tho that was a whole month salary.
Still hoping for updates, I think the drama is way further than the manga from vol.4 preview. I'm really curious what happened between tenman a la carte and this, which hopefully the author hints in the story.