Liam Sera Banfield was a salaryman who was manipulated by a demon into reincarnating into a universe of advanced science and magic where humanity has spread throughout the stars. In his previous life, his wife cheated on him, divourced him, sued him for child support and took custody of their child, causing him to end up dying due to overworking while trying to make his monthly payments. Now that he has reincarnated as the son of an artistocratic family, he resolves to live selfishily while enjoying his life. Then he gets OP powers and a harem.