The student council president Chidori Saki (called "Iceberg" by his classmates), who is both talented and beautiful but cruel to others, is actually an arrogant house boy. One day, he received a strange large mail, which contained a talking cat doll - Ambergris! ! Not only did its unauthorized residence not frighten the family, but it turned out to be a warm welcome! ! It wasn't until the raid in the school library the next day that Ambergris slowly revealed that the reason he came to Tokyo was to find the successor to the leader of the Slaughter clan...