The protagonist, Honda Rei is the only son of the world-famous Honda zaibatsu. While his genius scientist mother and his world renowned actor father are often busy abroad, he has his sister-in-law, an attractive college student, his childhood friend and best friend with him leading fun happy student lives. They attend a school for the ultra wealthy elite where the majority of the students are sons or daughters of financial heavyweights. However, there are also commoners attending the school, possible due to scholarships, too. Once, Rei saved a commoner student from a predicament and they became close because of it. And then comes the turning point. The school's boast, the legendary event, the "Advent Festival". Besides the fact that its events are different from normal schools' festivals, it has a school wide ball participated by all students. The center-point of which are the year's so called MVP, two students which are given the title of "Prince" and "Princess". It's not only a high honor, there's a well known legend that the two people selected will be forever tied to each other living happy lives. As expected Rei was selected as the prince. Unfortunately they have difficulty selecting the princess. The school chairman said, "I leave the decision on who would be the princess to you." Who would he select as the princess? You are invited to this erotic and moe ball!