intro:Seventeen-year-old Kiriyama Ling (voiced by Kengo Hexi) is a chess player. His miserable childhood experience made him lose his family since childhood. He has lived alone with heavy memories for so many years. Over time, Zero has become accustomed to suppressing his feelings and has built an unshakable high wall around his heart.One day, Zero met three sisters of the Kawamoto family - the gentle and considerate elder sister Akiri Kawamoto (speaking by Ai Kawamoto), who is good at taking care of others, and the cheerful and optimistic personality, who is very bad at cooking housework, and the younger sister Kawamoto Momoto (speaking by Misaki Kuno), who is still in the nursery school.The appearance of the three sisters made Zero feel the warmth of home again and regain the long-lost happiness.At the same time, the appearance of powerful opponents such as Nikaido Haruno (voiced by Okamoto Nobuhiko), Triceratopsho (voiced by Tomokazu Sugita) and Matsumoto Ikhasa (voiced by Akira Homura) also ignited Zero's love for the fighting spirit of Masao.