Some guys wait their entire life to meet the girl of their dreams, but high school freshman Rihito is already living with FOUR of them! And they're (almost) always ready and willing to help him with whatever difficult task their "Master" needs to be handled. So, how did Rihito get to be so lucky? Well, while Hina, Ann, Ines and Rene may not be exactly high maintenance, Rihito does have to make sure that they're lubricated regularly and their batteries are recharged. That's because they're Shinki: tiny, six-inch high, customizable androids. But don't let their tiny size fool you. These little ladies have more than full-size intelligence and emotions, and since each one would prefer to be Rihito's favorite, there's sure to be a little mechanical friction! Get ready for sparks to fly as these battery powered princesses take charge of Rihito's world in BUSOU SHINKI!