Hijiri Kasuga

Hijiri Kasuga is a childhood friend and cousin of Arata who disappeared due to a Breakdown Phenomenon after giving the Astil Manuscript to him. She is later on revealed to be a magus sent by Royal Liber Academy to pose as his cousin and eventually returns as a member of Iscariot.

Personality
Hijiri is a cheerful and poised young lady, as well as a strong devotion to those close to her, especially towards Arata. Despite having been assigned as his observer, she cares deeply for his well-being, becoming more concerned of his protection than her own, and even willing to entrust Sora to him before she disappeared due to a Breakdown Phenomenon. As suggested by the opposite of her Thema Ruina, Hijiri is concerned more of others and passionately determined to protect her loved ones. After witnessing Arata's future, she became willing to fight the entire world for him, angry and unforgiving of the world using him as a means to its revival. Often saddened by her current situation, she sometimes will have small periods of extreme vulnerability, such as nearly collapsing in tears after Arata promises to bring her back. Neverthess, she remains incredibly resolute in achieving her goals.

However, Hijiri also has a very cold and ruthless side, willing to go to extremes to accomplish her objectives such as murder or even destroying the world. Surpringly, she would even attempt to kill Arata and the Trinity Seven, intending to resurrect him after her plans were accomplished. Additionally, she can be quite forceful and intimidating, once almost causing Lieselotte to hesitate in her decision to support Arata. In her initial confrontation against Anastasia-L, their tense interactions would greatly frighten Lugh and Anna's companion. During battles, Hijiri displays a calm and calculating attitude, able to confidently attack and defend against enemies. Although, she can be surprised by any unexpected developments.

While sometimes overly serious, Hijiri is usually quite calm and light hearted, once awkwardly commenting on Arata's perverted antics. Among trusted friends and allies, she is more friendly and approachable.

Appearance
Hijiri is a young slender young woman with short blue hair and a single ahoge on top of her head. She bares a striking resemblance to Arin Kannazuki, but is far more expressive of her emotions. After disappearing due to a Breakdown Phenomenon, her hair grew noticebly longer but has since returned to her original shortness. Additionally, she also has a small  hair clip on the left side of her bangs, but sometimes wears another one on the right side as well.

Prior to vanishing, Hijiri wore a sailor fuku which consisted of a white long sleeved blouse with a sailor collar, a red ribbon tie, a dark pleated skirt, dress socks and penny loafers. After returning as a member of Iscariot, she adorned a short dress under a long sleeve hooded robe.

Satan: In this form, Hijiri's hair grows even longer, a crack-like mark appears on her right cheek similar to that of Astral Trinity's, and her hands transforms into large monster like claws. She also wears a headband, a long dark off-the-shoulder dress worn under a shoulderless cape held together by a brooch attached to a metallic choker, and a pair of dark slipper shoes.

History
Sometime ago she was placed with Arata to monitor his development as a Magic King, while his parents were missing, claiming to be his cousin. She ended up fully integrating herself as his cousin, worse still, she ended up falling deeply in love with him, to the point of acting like a tsundere.

After Hijiri was engulfed by the "Breakdown Phenomenon" Arata created, she was expelled from the world to the "outside." It was truly a "world of nothingness," she learned how she'd been living in such a wonderful slumber, like everything until that point was a dream. But, somewhere inside, she was satisfied.

Then, as her sense of time was leaving her, and her consciousness was fading away. She was suddenly able to see into the "world" from the outside. There she saw a future, where Arata and the Trinity Seven had destroyed the entire world. The world had been reduced to nothing by the birth of the Magic King and the Trinity Seven. And then a new world was reborn. However, the Magic King and Trinity Seven would meet again, and once again the world crumbled. She watched the world be destroyed by the Magic King and the Trinity Seven over and over again. That was the future awaiting the world, a never-ending cycle with no way out. She knew the same would happen there eventually. A Magic King Candidate would become the Magic King, and together they would destroy the world. That was why she couldn't forgive the world for treating Arata as nothing but a tool for its reincarnation.

She didn't want Arata to become the Magic King of "Imperium," so she and Iscariot would destroy the world instead, and then make a world that Arata could enjoy freely.

Abilities
She has mastered Ruina, Baltan, and Analysis of the Ira Archive. By mastering three separate thema, she already has what it takes to be a "Trinity." She seems to cast spells using the magic system Chaotic Rune, which is based on Norse Runes.

Hijiri received the Magic King Element from the "Ruined World," after being disintegrated by Arata.

By making use of the Magic King Element and her Trinity status, she is able to take on the form of an archive. The manifested form of the archive Ira, "Satan". In this form, which exceeds Magus Mode, she is shown to be able to overwhelm the entire Trinity Seven at once.

Hijiri is powerful enough to simultaneously have contracts with more than one of the legendary grimoires, before even being a Magic King Candidate.

Hirji can't stay in the world for extended periods of time as her body has been broken down by Arata's Breakdown Phenomenon. At present she is nothing but an existence swaying between space and time. When she is not manifested into the world, she appears as a gemstone similar to the Magic King Elements, within which her body is visible.

Satan
Is the manifested form of the Ira Archive. In this form, Hijiri is capable of overwhelming the entire Trinity Seven at once. The transformation itself causes her visible pain however.

Baldr's Blessing
Baldr's Blessing is a Vegtam spell that encompasses both offense and defense. Baldr is also a legend among gods.

Royal Biblia Academy
Arata Kasgua - TBD

Arin Kannazuki - Arin and Hijiri have an unknown connection, as they are both not only physically identical, they use Chaotic Rune to work magic.

Iscariot
Lugh - TBD

Trivia

 * Hijiri's manisfested form of Ira is a reference to the demon Satan. In Christian mythology, Satan is often considered the demon most associated with the sin of wrath. It can be assumed that this applies to other manifested Archives as well.
 * In the first print of chapter 0, Hijiri's hair color was initially brown in the color pages. However, in the volume 1, her hair color was changed to light blue which has been used since then.
 * It is currently unknown why Hijiri and Arin look almost identical to each other.