I've no more grandparents left and the gran being a kind hearted person who has a veg garden watching vtubers reminds me of my grandma, tho not the watching vtubers. Everyone should love and hug their grans if they're close to them.
Soon they'll pass and you dont want to be thinking to yourself that you should've spent more time with them.
Ontopic I love this manga so much. It made me care about some fictional granny now living alone cos her husband passed away to cancer.