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Ram (ラム) is one of the twin maids working for Roswaal L Mathers. Originally, Ram was born as an Oni with a single horn and displayed exceptional talent and strength which resulted in the village referring to her as the second coming of the Oni God.

Rem (レム) is one of the twin maids who worked for Roswaal L Mathers.
At the end of Arc 3, she had her name and memories eaten by Lye Batenkaitos and was subsequently put in a suspended animation. With Lye’s death, Rem woke up from her deep slumber which lasted for roughly one year and a half but has not regained her memories yet, effectively making her a walking shell of her former self.