Kiriyama Ling (played by Ryunosuke Kamiki) is a recognized genius in the shogi world. At the age of 17, he has become a professional chess player and has defeated countless older and more numerous opponents on the chessboard. In fact, Ling has a tragic past. His family members all died in a terrible car accident a long time ago. After that, Ling was adopted by his father's friend. His adoptive father is a shogi enthusiast. In order to make his adoptive father happy, Ling studied the chess score day and night, but he never thought that his inadvertent actions caused the family to fall apart. In the end, Ling decided to leave his adoptive father's house and live alone. In his opinion, as long as he does not rely on anyone and does not have any connection with anyone, he will not hurt anyone. However, the kind and enthusiastic Kawamoto sisters broke into Ling's life, and Nikaido Harunobu (played by Sometani Shota), who has always regarded Zero as his nemesis, also made Zero gradually walk out of loneliness.