Kyouran no Akujo

A boy, Toru, whose mother and sister were burned to death due to a fire in the cooking, and only his father and Toru were left alone. It was during this time that his father's co-worker had lost her husband and become a single mother. But Kyoko was a bad woman the opposite of that gentle and beautiful front face!
He uses all means to eliminate obstacles and approach Toru's father. For her, the existence of Toru was only in the way.

Original Web Novel

Original Webtoon