Just upon returning to his apartment from jogging, aspiring Mage Knight and flunking Hagun Academy student Ikki Kurogane inadvertently walks in on a half-naked girl changing in his room. While being admonished and forced to apologize by Academy Director Kurono Shinguuji, Ikki learns that the girl is Stella Vermillion, a famous A-Rank Blazer who is the princess of the Vermillion Empire and his new roommate...