Astil Manuscript/Relationships

Masters
Arata Kasuga - Sora's current master, Sora first came to know of Arata during Hijiri, her previous master, Arata first became aware of Sora after she was entrusted to him by Hijiri to protect him from a Breakdown Phenomenon, as well as grant his wish before disappearing. Horrified, Arata would then demand Sora that she give him back his normal days, which she would fulfill while posing as Hijiri. After her deception was discovered, Sora has since continued to assist and protect Arata, eventually forming a contract with him allows him to use her magic.

Despite knowing each other for a relatively short time, the two quickly developed a close and trusting bond due to their similar easygoing and mischievous personalities. Sora, in particular, enjoys being with Arata's straightforward and perverted behavior, as well as finding her master both entertaining and interesting. As such, she is usually watching him or playing along with his antics. Nevertheless, Sora is very loyal and supportive of Arata, willing to follow his decisions and always looking out for his well being. Likewise, Arata has complete faith in her, relying on her strength in many different situations. Notably, in spite of her being a grimoire, Arata deeply cares for Sora and views her as a friend, rather than a tool. Her imprisonment by Ilia was one of the deciding factors that would cause Arata to change into Astral Trinity. Although, Sora would eventually return him to normal, stating that she preferred "the idiotic master". Additionally, Sora and Arata are also able to work together as a strong and effective team during battles, supporting and believing in one another.

Hijiri Kasuga - Hijiri is Sora's previous master for an unknown amount of time, originally being the one who gave the grimoire her current name. Prior to disappearing due to the Breakdown Phenomenon, Hijiri entrusted Sora to protect Arata and fulfill his wish, which she has since then faithfully continued to follow. Despite no longer being together, Sora would help Arata in his goal in finding her former master, confirming that Hijiri was still alive. Although the two would eventually reunite as enemies, neither one would hold a grudge against the other.

Grimoire
Ilia - Similar to Sora, Ilia was originally Hijiri's grimoire for an unknown amount of time prior to later joining Arata. During the Breakdown Phenomenon that destroyed Arata's hometown, the two would separate after Hijiri entrusted Sora to Arata while Ilia remained with her before disappearing. Later on, they would eventually reunite when Arata and Mira became trapped in Ilia's barrier while investigating the Royal Biblia Academy's destruction. Despite Ilia using Hijiri's appearance, Sora would immediately recognize her before subsequently confronting her in battle, treating each other in a rather friendly and calm manner regardless of being enemies. Ultimately, Sora would lose and become trapped by Ilia who intended to use her as a magic power source until Astral Trinity indirectly freed her.

After defecting to Arata, Ilia has since remained on friendly terms with Sora who, in particular, did not hold a grudge against her. Although, Ilia is usually bewildered by Sora's nonchalant and mischievous personality, whom the latter also often enjoys teasing her. Regardless, the two are actually quite close in spite of Ilia's denial. Sora once stated that they were close enough to never stop fighting. They both respect and understand the others abilities, allowing them to work together as an effective team to help support Arata.

Family
Radix Astil - Originating from Radix, the two are considered to be "mother" and "daughter." After Arata forfeits his Demon Lord Element, Radix travels to Biblia in order to retrieve Sora, considering him unworthy of being her master in spite of her copy's opinion. However, Sora has been allowed by her mother to remain with Arata temporarily, until she is  required for Radix's goal, to revive the true Demon Lord. Although Sora is hesitant about her mother's methods in trialing Arata, she is nontheless confident in her master's strength.