Nishikata, a mischievous middle school boy, smirks as he glances over at Takagi, the girl beside him in class. After suffering through her merciless teasing, he has finally devised the ultimate plan for revenge. But before he can put it into action, Takagi intervenes with a single comment, once again leaving Nishikata at a loss.
Their encounters have led to an unwritten rule: "blush, and you lose." Nishikata spends each day attempting to embarrass Takagi, but he only ends up being ridiculed even more. The question remains: will their relationship ever move beyond this vicious cycle of one-upping each other?