Mari has always liked her older brother, Tsuyoshi, who was good at both studies and sports. Now I'm frustrated and NEET. One day, Mari makes a proposal from Tsuyoshi, who is withdrawing in her room. "Let's play the king's game!" Due to her super-brother-like personality, Mari decides to play the king's game with Tsuyoshi. And she has a ridiculous order from Tsuyoshi who became a king... “From today onwards, I will continue to be the king for the rest of my life, so I will absolutely obey my orders!!”
