Mitsuko, Japan's first female detective, and her assistant Saku, the heir of Yoshida Department Store, are keeping busy with what seems to be a minor case. Someone is tearing down advertisements for a new beauty treatment, leading Mitsuko to the Imperial University to ask questions. There, the detective is trapped by a suspicious student with rose-colored fingernails...a clue! Can Mitsuko keep the situation from turning ugly before it's too late?!