Japanese literature Bad sister

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Japanese literature
"I decided to kill my sister for the sake of a peaceful life," says Kuraishi Mayu, born in March, and her sister Rin, born in April. They both entered the same high school in the same grade because they were about to be born. When they became the second year of high school, Mayu made a plan to kill their sister. The older sister is a beautiful girl who everyone looks back on, but she is mean and cruel. She has been repeating problematic behavior such as bullying since she was a child. She has always dreamed of breaking away from her "poison sister" and has been defeated. What is the path of trial and error? And what is the sin that she herself carries? A story of how she is released from her assumptions and moves toward freedom.