TV-Series
Description
Maria Naruse is the illegitimate daughter of the former Demon King Wilbert and Sheila, a powerful succubus. At birth, Sheila transferred the majority of her power to Maria, leaving Sheila permanently weakened and appearing youthful; Maria consequently internalized blame for her mother's condition throughout childhood.

Approximately six months before the main events, Maria rescued Mio Naruse after the demon Zolgear murdered Mio's adoptive family. During their escape, Maria temporarily unlocked her full power using her Magic Key, allowing them to narrowly evade capture. They remained on the run until encountered by Jin Toujou, who orchestrated their move into his home under false pretenses of marrying their mother. Within the Toujou household, Maria assumed the role of Mio's guardian.

Physically, Maria presents as a petite 15-year-old with long silver hair, purple eyes, and a height of 139 cm. Her typical human guise attire is a black dress with white frills, black leggings, and boots adorned with purple hearts. Her demon form features small black horns, slit-pupil purple eyes, a revealing black leather outfit, white and pink-striped leggings, black boots, and small wings near her waist. Activating her Magic Key transforms her into a curvaceous adult woman with enhanced physical attributes. Her Reverse Magic Key form, unlocked after discovering her true heritage, maintains her usual stature but adds thicker, longer horns, an elongated tail, and gauntlets, though this form drains her life force.

Her personality blends playful mischievousness with deep loyalty. She frequently teases household members, particularly Basara Toujou, and engineers sexually charged situations to "strengthen bonds," reflecting her succubus nature. Despite this outward levity, she harbors profound guilt over her mother's condition and periodically questions her self-worth. Her protective instincts toward Mio are unwavering, though her methods sometimes involve deception, such as withholding the true nature of the Master-Servant Contract until trust was established. As she matures, she evolves from orchestrating others' intimate encounters to actively participating in them, discovering personal inclinations toward exhibitionism and masochism. She suppresses her romantic feelings for Basara initially, rationalizing them as support for his bonds with others, but gradually asserts her own desires for closeness with him. She maintains camaraderie and shares confidential secrets with other household members.

As a succubus, Maria possesses abilities tied to desire and intimacy: invading and manipulating dreams, absorbing energy from sexual situations to enhance strength or restore vitality, and performing "Baptism" rituals inducing aphrodisiac effects mirroring the Master-Servant Contract. Magically, she specializes in memory distortion/erasure and contract formation; her unique succubus-based contracts initially inflicted aphrodisiac curses. Discovering her lineage as Wilbert's daughter manifests gravity manipulation abilities, though with less control than Mio or Basara. She channels gravitational force into shockwaves for combat, classified as a "Hard Striker" specializing in close-quarters power strikes. Using the Magic Key elevates her combat prowess to S-Rank demon level, enabling battles against threats like Zolgear.

Her character development revolves around overcoming self-doubt and embracing her heritage. Early struggles with feelings of culpability for Sheila's state gradually give way to acceptance after learning the truth about her parentage. Training with Basara following a defeat cultivates her gravity powers and combat resilience. Forming a Master-Servant Vow with Basara unlocks her full potential, including the Reverse Magic Key form and abilities surpassing Sheila's prime; this pact also transfers her Wood Element to Basara, symbolizing their deepened connection. Her role shifts from observer to active combatant and emotional pillar within the household. By the series' conclusion, she becomes one of Basara's wives and bears his child.

Notable trivia includes her responsibilities as a primary cook alongside Zest, preparing meals that facilitate spontaneous anal intercourse among household members by eliminating the need for enemas. She privately reviews eroge games to "assist" Basara's harem dynamics and maintains a private Twitter account for sharing recorded intimate moments. Her birthdate is March 26, 2008.