As Lucy, Kouta, and the family of the Maple House try to bury their demons and strengthen their bonds, a sadistic evil stirs in the depths of the Institute that will threaten to destroy the life they have built together, and put those bonds to the ultimate test. When darkness reaches into their hearts, they must endure together, or lose everything.

Finding there was too much left unsaid, Lucy realizes she is not ready to give up her life, or her love, and struggles to find out who and what she really is. Set in the anime version shortly after Lucy departs Kouta in the last episode.