@issen @Ghang
Roasted sea salt/焼塩 (dried in order to remove moisture) as opposed to (regular unroasted) sea salt (wet, retains more water content).
In Japan (and other parts of the world), salt is commonly used as a purifying agent and/or to ward off spirits.
(No word from spiritual experts whether dry salt or wet salt is more "effective".)
The particular brand referenced here is Hakata Salt, one of the more well-known brands in Japan.
(You can note the symbol in the upper right corner of the bag matches up.)
Its commercials have spawned several memes and lots of parody videos, including a fan-created mascot.