MIAE-256 A younger sister who is extremely devoted to her brother and continues to follow the orders of her brother, who became king in the King's Game, for two days straight. - Mari Takasugi

Mari has always liked her older brother Tsuyoshi, who was good at studies and sports. - Now I'm a NEET with a setback. - One day, Tsuyoshi, who has been holed up in his room, makes a proposal to Mari. - ``Let's play the King's Game!'' Because Mari is very caring towards her older brother, she decides to play the King's Game with Tsuyoshi. - And Tsuyoshi, who has become king, gives an outrageous order... - “From today onwards, I will continue to be your king for the next two days, so you must absolutely obey my orders!!”