Kouta Higashiyama

The illegitimate child of Higashiyama Keizou. He becomes the heir to his father's company because Kouta is Keizou's only son. Before becoming an heir, he lived with his mother, who, however, did not feel any attachment to her son, seeing in him only as the child of her beloved person. He perfectly knows how to play chess, thanks to which he developed a sharp mind.