She is a younger sister who has been following her brother's order to become king in the King's Game for two days. Masato Takasugi

Masato always liked her brother, Tsuyoshi, who was able to study and play sports well. Now I'm having a dip and Nate. One day, from the squirrels that were stuck in the room, Masato was offered a proposal. "Let's play the king's game!" Masato became to play the King's game with Tsuyoshi due to his super-brotherish personality. And then there was a terrible order from the goodness of becoming king. "I will always be king for two days from today, so I will definitely obey my orders!"