Cast (From dlsite) I don't think Inseki applies, maybe Incest
・北条舞・Hojo Mai She is a mother of two children. She is a brilliant and talented woman who works as a section manager at a prestigious company. She is a master of Aikido and teaches as a master at the dojo.
・北条由衣・Hojo Yui Daughter of Mai Hojo. As the head of the school's Public Morals Committee, she strictly enforces Public Morals. At the Aikido dojo taught by her mother, she is so skilled that she even throws away her instructor.
・北条忠道・Tadamichi Hojo Hojo Mai's son and Hojo Yui's younger brother. He is still young.