Stepsiblings

The story follows stepsiblings Sora, an eighteen-year-old who is great at strategizing, and Shiro, an eleven-year-old whose specialty is calculations and logic.

After his father's remarriage, high school student Yuuta suddenly finds himself "stepsiblings" with his classmate Saki.

The sheriff’s office said that victims included three stepsiblings of the boy: a 6-month-old baby boy, a 5-year-old girl, and a 6-year-old boy.

In Islamic law, marriage among close blood relations like parents, stepparent, parents in-law, siblings, stepsiblings, the children of siblings, aunts and uncles is prohibited, while first or second cousins may marry.