When Yukiya Asagi and Miku Sakura were in sixth grade, they developed a game where they would take turns saying "I love you" with the goal of embarrassing each other. Despite being in high school now, they continue to compete in this game. However, as they grow older, their feelings for each other have evolved beyond the game's rules. Although they both feel the urge to take their relationship further, they are hesitant about making the first move, unsure of what will happen once the game ends.