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신원: It's a fanmade MSA anime and manhwa.
배경: In Tokyo, Japan, in 2018, a 26-year-old young woman named Ritsuko from the Hashimoto family who is a jujutsu sorcerer who has a well-behaved younger stepsister named Misuzu who is 6 years old from a different mother from the Takahashi family and is an elementary schoolgirl from the same elementary school that Ritsuko attended as a 6-year-old just 20 years ago but now as an adult woman as a 26-year-old now, she knows how to take care of herself and Misuzu and the house, cooking, baking and cleaning properly and carefully and well-skillfully. One day, while she and Misuzu went for a backpack called a randoseru, she chose the lavender one that she'll be using it until 6th grade and Misuzu was always patient while waiting until she's in 6th grade and chose the red randoseru backpack because the elementary school students have black and red randoseru backpacks, black ones are for boys and red for girls. . . . What happens next?