ST?RISH had a successful debut, and now they are professionals! It's time for the Master Course. Haruka Nanami moves to the dorms and meets up with her ST?RISH colleagues. They eventually meet up at their large training room, where Haruka gives everyone an individual song. Suddenly, the Shining Saotome arrives and introduces QUARTET?NIGHT who perform the song "Poison Kiss." Three members QUARTET?NIGHT become mentors to ST?RISH . Reiji Kotobuki is assigned to Otoya Ittoki and Tokiya Ichinose, Ranmaru Kurosaki is assigned to Ren Jinguji and Masato Hijirikawa, and Ai Mikaze is assigned to Syo Kurusu and Natsuki Shinomiya. ST?RISH learns that it won't be as easy as it seems, as they will be living with their superior mentors who have many rules for them. Meanwhile, Haruka finishes unpacking when she hears the black cat, Kuppuru. She is surprised and runs to find it, only to find Cecil. He greets her by kissing her on the hand and calls her "my beloved princess."