I Won Against the Girl Who Was Undefeated in the “I Love You Game”

It’s a one-shot; there isn’t really a description from the author. The title kind of gives it away. The protagonist manages to defeat the girl who was considered undefeated in the ‘I love you game.’ In this game, both parties will tell each other “I love you” (aishiteru), and the one who gets embarrassed first loses.