Ryoutei no Aji

CMs with strong nostalgia for parent child bonds. 

Food commercials around a minute long of such a high quality that makes you wonder why you even bother watching most full length anime in the first place. Amazing animation and artistic direction. Very different style-wise and content-wise though; the miso ads are more mellow/bittersweet/heart-breaking and the noodle ad is... well... pretty extreme. 

Wholesome commercials about families that love and support each other, and the sacrifices they make. 

Nostalgia for times gone by, with a touch of old Ghibli-style magic.  

Nostalgic little adverts for comfort foods that reminds one of days gone by. 

Touching shorts about childhood, family, growing up, and adulthood. Great attention paid to the small details in human behaviour, anime realism at its best. 

Both are about interpersonal relationships and food. Obviously Ryoutei no Aji is selling miso soup, but Oishinbo is promoting Japanese cooking more generally.