This series is set against the backdrop of the protagonist Rubi's growing-up life. It tells the story of Rubi, who, to verify the knowledge she learned in class, records all her in-class questions in a Question Mark Handbook. Later, she embarks on a great adventure to fill in the answers to all the questions in the handbook. Finally, through her unremitting exploration, Rubi fills in all the answers to the questions in the Question Mark Handbook and gains plenty of knowledge and friendship in the process.
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