Looking for a manga

Looking for a manga about a sales person trying to convince a family that owns a sake brewery to sell their sake through their company. However the grandpa and the grandson are both grumpy type characters who run off every sales person who has came knocking on their door. However the granddaughter is much nicer and tries to help the sales person win over the two men. I remember the grandson had black hair and is always wearing a bandana on his head. And that the sales person can’t hold his liquor well. I also remember a scene where something happens to the rice needed to make the sake. And the sales guy tries to help. But ends up getting the wrong kind of rice needed.

If anyone knows the name please help, thank you in advance!