Hey guys

I'm looking to re-read this manga I read a while ago but can't remember it's name. What I remember is it involved a sales guy and the son/grandson (?) of the owner of a brewery. The father is very stubborn and doesn't want to sell the product to the sales guy, so he comes buy every day and there was a mix up with rice where the sales guy brought them rice when they were low but it wasn't the right kind. Please tell me if you know the title.