Having watched the anime, the way Gramps died makes me even sadder because they expanded his moments a bit during Zenitsu's first flashback, he was charismatic and you could see he really cared for the boy. Oh well.
Damn, decided to take a look at the first chapter because I didn't remember how the manga started, and the art is so different now just 40 chapters later... I think it's better now, but it's cute here in the beginning too.