Hikaru Gero, heir to a family of poison-brewing assassins, has spent his life apart from ordinary people, and the clan has decided his little sister Akari will carry the next generation if he does not marry first. Hopeless with women, he hires Mei Kinosaki, a sharp-tongued marriage swindler, to coach him through the hardest job of his life. This second season continues Joumyaku and Mizuki Yoda's manga.