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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
