Seira Hoshikawa

Age: 13.

Birthday: May 17.

Blood Type: A.

Height: 159 cm.

Nationality: Japanese.

Her hair is turquoise and styled in twin tails, which lengthens and braids in her transformed mode.

Her visual motif includes growing crystals from her head and hands when transformed.

Seira is calm, logical, and highly disciplined.

She is strict with herself and others, hating to waste time and always punctual.

She strives to become stronger and works hard at both physical training and mental discipline.

While initially cold and even harsh, especially regarding her mission, she deeply values loyalty and bonds once trust is established.

She enjoys listening to music, particularly Western rock, and is passionate about astrology.

Seira was born into a family skilled in astrology.

Her formative years were marred by witnessing the death of her childhood friend, Manami Onodera, at the hands of a Daemonia.

This trauma led her to believe that those who are consumed by Daemonia are foolish and weak, and she developed an unyielding and emotionless approach to exterminating Daemonia.

Her past experiences became a shield, allowing her to keep her emotions at bay and to condemn Daemonia-influenced humans without sympathy.

Seira is a powerful archer, wielding a crystalline bow that materializes from the crystals on her body.

She is capable of both precise single shots and rapid volleys, adapting her attack style to any situation.

Her powers are linked to her Tarot card, "The Star," and she transforms into her Tenebrae mode, where her hair grows, braids, and her eyes are patterned with concentric circles.

The crystals erupt from her head and the backs of her hands, acting as both armor and weapon.

She is close teammates with Akari Taiyo, Luna Tsukuyomi, and Ginka Shirokane.

Originally, she was critical of Akari and other members for showing pity towards Daemonia victims.

After a traumatic mission involving the extermination of her friend Kanae Mishima—who became a Daemonia partly because of Seira’s advice—her view began to change.

Seira grew to understand and respect her teammates' empathy, realizing the importance of emotional connections and teamwork.

Her favorite food is chicken breast salad, chosen for its benefits to muscle building.

Seira has a decorative alpaca figurine in her room, which she bought as a birthday present for Manami on the day Manami was killed.

She lost her ability to enter the Astralux after being bitten by Daemonia-possessed Luna, marked by a black butterfly-shaped mark on her neck, but later regained her powers.

In the early concept art, her transformation was more witch-like, and she was adorned with hexagram-shaped hair ornaments.

Her power can make her body increasingly crystalized under great strain or strong emotions.

"I just have to do what needs to be done."

"Those who become Daemonia are foolish and deserve no sympathy."

"I will accept all of Luna, even her weaknesses."

Early Mission Stance

Seira joins the Newcomer Squad with a resolve to show no mercy toward Daemonia and considers them pure evil.

Her approach alienates her from Akari Taiyo, Luna, and Ginka, whom she criticizes for being too emotional.

Her childhood trauma of losing Manami to Daemonia is the core of her relentless stance.

Encounter with Kanae

Seira befriends high school girl Kanae Mishima, who is struggling to help her ill friend.

Seira advises Kanae to "do what you can," but this advice leads Kanae into despair, and she is ultimately corrupted by Kerubrem and becomes a Daemonia.

Seira is assigned to exterminate the Daemonia—unaware it is Kanae—only to freeze in panic when the truth is revealed.

With help from Akari, Seira manages to communicate with Kanae in her suffering, then reluctantly fulfills her obligation by slaying Kanae.

Emotional Shift

After confronting her lack of resolve, Seira confesses her fears and emotional struggles to Akari.

They reconcile, and Seira begins to open up to the team’s ideals.

Luna’s Incident and Recovery

During Luna Tsukuyomi's Daemonia possession, Seira is bitten and loses her powers, marked by a butterfly-shaped “curse.”

Kerubrem manipulates her, but Seira resists, relying on her renewed trust in her friends.

When Luna returns to normal, Seira’s power is restored.

She accepts Luna completely, flaws and all, and works with Luna and Ginka to rescue Akari.

Endgame and Growth

Shared battles and hardships help Seira realize the importance of emotional bonds and teamwork.

She comes to fully support Akari’s belief in the possibility of saving Daemonia victims, embracing her teammates as indispensable friends.

Seira and Luna are sent on an assignment to the London branch in the novel “Phantom Messiah.”

Her voice is provided by Eri Kitamura.