Japanese literature The evil girl my father loved Futaba Bunko

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Japanese Literature
Futaba Bunko : Her mother disappeared two years ago, leaving a letter saying, "I will commit suicide with a man." Still unable to believe in her death, Kaori, 16 years old, meets Shusuke, the son of Yamagishi, her mother's second marriage partner, by chance when she is introduced to her father's second marriage partner. Later, a detective who follows Yamagishi on suspicion of embezzlement of 100 million yen appears, but there was an accident in which murder was suspected? This is a long story of a high school girl fighting for a mystery about her Maria.