Luctus follows the personal journey of Nora, a fire sorceress searching for her missing friend, Luna. The girls grew up together after the death of their parents, united by their desire to find the being responsible for their father's death. Luna's sudden disappearance transforms their shared goal into Nora's solitary journey. The plot explores themes of life and death, forcing the heroine to confront deep grief and forge a lonely path through a dangerous world.