Selina Sherlock

Name: Selina Sherlock

Gender: Female

Age: 17

Height: 155 cm

Three Sizes: B80 / W56 / H82

Hair Color: Blonde

Eye Accessory: Glasses (rimless from below, used like a headband)

Distinctive Features: Twin-tails hairstyle, glasses worn as a pseudo-headband, camera always at hand

Affiliation: Biblica Academy (various timelines), Newspaper Club

Occupation (main timeline): Student, magician-in-training → full-fledged magician

Occupation (Revision timeline): Teacher at Biblica Academy

Voice Actor: Aya Suzaki

Selina is the twin younger sister of Lieselotte Sherlock and a key supporting character who gradually grows from a magician apprentice into a rare and highly valued magic user.

She combines academic brilliance with investigative curiosity, wielding numerology-based magic and a camera that evolves into a powerful grimoire.

Selina is a petite 17-year-old girl with blonde hair tied into twin-tails and a habit of wearing glasses as if they were a headband, giving her a distinctive and slightly quirky look.

Her bust is modest compared to her sister’s, humorously described by Arata Kasuga as a “convenient size,” which becomes a lighthearted running gag.

She projects a diligent, serious, and earnest personality, having studied hard alongside Lieselotte and achieving excellent grades.

Despite her association with the Archive of Sloth, her behavior is anything but lazy: she is proactive, investigative, and constantly on the move in pursuit of information.

Selina’s specialized magic system is numerology (Logos Word), a technique that uses numbers and formulas to analyze, predict, and manipulate phenomena.

Her Archive is Sloth (Acedia), and her Theme is Bind (Rigare), focusing on concepts of restraint, fixation, and anchoring.

Her early role is that of a support-type magician, focusing on measurement, analysis, and recording rather than direct destructive power.

Over time, her analytical capacity and binding-based magic allow her to influence extreme phenomena such as high-speed temporal states and complex future calculations.

Selina’s defining tool is her camera, which begins as a magical device and later becomes a full-fledged grimoire.

Originally, it serves as a magic apparatus that records, analyzes, and in special cases can “freeze” phenomena like ultra-high-speed motion.

She possesses a grimoire titled “Archytas’s Copy”, reinforcing her connection to numerical, geometric, and analytical magic.

During the Great Magic Research All-Out Battle, her camera awakens as a true grimoire, granting her an official Magus Mode and full magician class.

At the start of the story, Selina is introduced as a magician apprentice who does not yet possess a grimoire.

She is an active member of the school newspaper club, constantly on the hunt for scoops with her camera in hand.

Her diligent study alongside Lieselotte ensures that she is academically outstanding, even among other magicians.

Though initially in her sister’s shadow, Selina steadily proves she possesses comparable talent in her own unique field.

Lieselotte Sherlock is Selina’s twin older sister, and their relationship is central to her character arc.

They share the same specialty in numerology, but their personalities and physical traits contrast: Lieselotte is more voluptuous and flamboyant, while Selina is more modest and studious.

Selina deeply admires and cares for her sister, and many pivotal moments revolve around saving or supporting Lieselotte.

Even in parallel timelines, her actions often exist to free Lieselotte from guilt or suffering, underlining a powerful bond between the sisters.

Battle with Lugh

During the confrontation with Lugh, Selina performs a remarkable feat involving her camera and her Theme of Bind.

She manages to “stop” the ultra-high-speed world where Lieselotte is acting and binds Lieselotte’s consciousness into her own body, effectively anchoring her sister and preventing disaster.

This event showcases Selina’s potential to interfere with extreme temporal and spatial conditions.

It also hints at her innate compatibility with more advanced and rare Archives.

Awakening of Her Grimoire and Magus Mode

After Lieselotte returns to the real world, Selina continues her magical research with serious dedication.

During the Great Magic Research All-Out Battle, her strong desire to rush to Lieselotte’s aid causes a turning point.

In response to that resolve, her beloved camera, originally only a magical device, qualifies as a grimoire and fully awakens.

At the same time, Selina obtains Magus Mode and recognition as a formal magician, allowing her to fight on even terms with high-level threats.

Together with Lieselotte, she repels assassins sent by Anastasia-L, demonstrating her new combat and support capabilities.

This marks her transition from a background analyst to an active frontline contributor.

Divine Comedy Gate Arc

In the Divine Comedy Gate arc, Lieselotte disappears again, prompting Selina to step forward.

Selina requests to accompany Arata Kasuga in Lieselotte’s place, showing her increased confidence and sense of responsibility.

Biblia (the Headmaster) agrees to her participation, with the condition that she must flee immediately if things become too dangerous.

The fact that this is considered acceptable proves that her strength and reliability have grown significantly.

Later, Selina is kidnapped by the Twelve Demon General Milione, who attempts to devour her together with her magical power.

She is rescued by Lieselotte, who creates the manifested outfit “Belphegor”, further emphasizing the sisters’ mutual support.

During the final confrontation with the Demon Lord, Selina focuses on measurement and analysis from the rear lines.

At one point she completes a measurement fractionally earlier than Lieselotte, subtly indicating that her talents rival, or at least approach, those of a member of the Trinity Seven.

Recognition and Rare Talent

After the battle with the Demon Lord and the return to the academy, the weapon Judeccha praises Selina.

Judeccha describes her as possessing “extremely rare talent,” signaling that her abilities are something unique even among gifted magicians.

Shortly afterward, the Arbiter Aries appears before the sisters as a cosmic-level judge.

Aries reveals that Selina is the only existing individual with the aptitude for the lost Archive “Melancholy (Cavum)”, a previously erased or sealed magical domain.

This revelation raises Selina’s importance to a cosmic level, connecting her to fundamental structures of the magical world.

In the new story arc, Selina is scouted by the heavens to become the Heavenly Arbiter of Melancholy.

This role would place her among divine judges, overseeing and regulating the lost Archive.

However, as of the current point in the story, Selina has not successfully connected to the Melancholy Archive or its “Holy Ark”.

Her potential is acknowledged, but her access remains incomplete, implying ongoing development and future growth.

After Arata travels to the Black Emperor Flame Realm, Selina is taken to the heavens by Biblia.

There, she works alongside Aries, focusing on re-calculating possible futures to prevent both the world’s collapse and Lieselotte’s disappearance due to the resurrection of the “Goddess of Deep Darkness.”

Selina’s work becomes deeply theoretical and predictive, aligning perfectly with her numerology expertise.

In this phase, she evolves into a high-level analyst of destiny and cosmic structures, rather than a conventional combatant.

Origin and Death in Beta Space-Time

In the “beta” space-time, an alternate past event diverges from the main timeline.

During a magical incident, Selina and Lieselotte choose to return to their mansion to check on a hidden “something,” a decision that turns fatal.

There, Selina is killed by attacking demons.

However, through the power of the mythical armament Gleipnir, Lieselotte performs a Mystic Fusion, allowing Selina’s personality to linger.

In this state, “Selina” continues to function without realizing she is effectively dead.

In reality, her existence has become just the personality simulation of a mythical weapon mimicking Selina rather than the original human.

Final Act and Release of Lieselotte

When the main timeline Lieselotte arrives in the beta timeline and tries to put an end to this “fake” Selina with the deadly weapon Dáinsleif, a decisive moment occurs.

Beta Selina interposes herself and takes the strike instead.

By choosing to accept her own death and step aside, she wishes for her sister to be freed from guilt, grief, and obsession over her death.

With that, she returns to being simply a mythical armament, her human existence effectively concluded.

Even so, traces of the Bind (Rigare) Theme and Selina’s own will seem to linger within the weapon.

These remnants reflect how strongly Selina’s sense of connection and responsibility persists beyond death.

Ultimately, after Aries repairs all space-times, the restored world unfolds differently.

In this repaired version, Lieselotte obtains Gleipnir earlier and defeats the demons, allowing Selina to survive instead of dying as she did in the beta timeline.

In the spin-off “Trinity Seven – Revision”, another version of Selina appears with a different role and appearance.

Here, she works as a teacher at Biblica Academy, supporting the protagonists as a knowledgeable instructor.

Her hair is now very long, reaching almost her full height, and tied back into a ponytail, giving her a more mature impression.

Her physical age is around 25 years old, reflecting a clear visual and social progression from her student days.

This version of Selina is confirmed to have mastered numerology and to be a magician of the Sloth Archive, similar to her main-timeline counterpart.

However, the series does not reveal whether she possesses the same rare aptitude for the Melancholy Archive.

It remains unclear whether the Revision timeline is the future of the main story or a fully parallel world.

Regardless, Revision Selina retains her core traits: analytical brilliance, magical expertise in numerology, and a supportive role toward other characters.

Selina’s core magic, numerology, symbolizes precision, calculation, and an almost scientific approach to magic.

Her Archive, Sloth (Acedia), contrasts ironically with her hardworking and active nature, suggesting that her magic deals more with states of stillness, fixation, and suspension rather than personal laziness.

Her Theme, Bind (Rigare), appears repeatedly in key moments: binding her sister’s consciousness, anchoring phenomena, and even lingering as will within fused weapons.

This Theme aligns with her personality: she ties people together, stabilizes situations, and acts as an anchor for others’ fates.

Her potential connection to the Melancholy Archive (Cavum) adds an emotional and philosophical dimension.

Melancholy, combined with binding and stillness, suggests a deep connection to loss, memory, and the desire to hold on to people or worlds that would otherwise slip away.

Throughout the series, Selina evolves from a curious, camera-toting club member into a critical backline strategist and cosmic-level talent.

She often takes on roles such as scout, analyst, and recorder, but gradually gains the power and authority to stand alongside high-tier magicians.

Her narrative function includes supporting Arata and Lieselotte, revealing hidden aspects of the magical world, and providing a human face to complex concepts like Archives and future recalculation.

Even in alternate timelines, her existence revolves around protecting or emotionally freeing her sister, emphasizing her enduring loyalty and compassion.

While she may not always be at the forefront of battles, her growth shows that analysis, calculation, and quiet determination can be as powerful as raw destructive force.

Selina’s blend of rare aptitude, emotional depth, and subtle heroism makes her one of the most intriguing and uniquely gifted characters in the Trinity Seven universe.