In the books, the titular Grandma seeks to explore the true meaning of the Japanese phrase "mottainai" after her son asked her what it meant and she couldn't answer. "Mottainai" is a commonly used exclamation that roughly translates to "what a waste!", expressing regret over wastefulness. The Grandma seeks to explore the meaning and importance of "mottainai" in the story.
Mottainai Grandma Goes to the River
Mottainai Grandma
Mottainai Grandma "Let's Eat with Gratitude"
Mottainai Grandma Goes to Magic Land
Gate
Dinosaur Expedition Born Free
Place to Place
Totonoe! Sakuma-kun by ＆sauna
Gundam vs Hello Kitty
Huckleberry no Bōken
The House Spirit Tatami-chan
Uchitama?! Have You Seen My Tama?
Amazing Nuts!
Buddy Go!
Book Girl: Memoire
The Karate Kid
ERASED
Ajin
Ojisan and Marshmallow
Alice in Wonderland
Hyouka
Amagi Brilliant Park
Myriad Colors Phantom World
March Comes In Like a Lion