On the day Ritsuka's brother, Lindo, return home, Ritsuka is called to the student council by Rem, president of Shiko Academy's student council. Ritsuka runs in with the members of student council. It ought to be just an unusual day but when Ritsuka returned home, she saw her mother collapsed. He saw strangers who are obviously not human. What is the forbidden grimoire leading the demons, vampires and the exorcists into a competition to obtain it? Rem's care let Ritsuka off the hook from the situation and she gradually grows attached to him. In the meantime, Ritsuka feels confused about the secret that her brother's hiding. Who can she turn to? Here's Ritsuka's journey to a brand new ending.