"Hey, be my dog...You don't want them to find out, do you?" Thus begins Tachibana's humiliating life as Haruki's servant. As she contends with Haruki's petty harassment...a familiar face returns to this immature person's life: his twin brother, Haruka. Up against Haruka's bizarre brotherly love, Haruki's behavior does a complete one-eighty...! Will Tachibana get to the bottom of their relationship?!