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Identität: It's a fanmade MSA anime and manhwa.
Hintergrund: In the Edo period, in 1670, a 20-year-old woman named Amari had a younger sister named Umi who was just constantly pestering her by playfully hitting her, so she's just always comparing her and asking Umi why she couldn't be more like other girls her age who don't pester their sisters, it got to the point where she's even started constantly questioning her father whether Umi was even her biological younger sister. Her father didn't understand why the oldest daughter he loved always seemed to want to compare Umi by asking why she couldn't be more like other girls her age, he complained so often about it. Umi was so shocked and also couldn't understand why either, so, she stopped pestering Amari. What happens next?