Royal Biblia Academy[]
Arata Kasuga - Seventeen years ago, Anastasia-L was determined to meet the Demon Lord Candidate, due to her strong love for the world. Describing him as her soul mate despite never meeting him, Anna was also hesitant at the idea of destroying him. After resurrecting in the present, Anna and Arata would first encounter one another after passing each other during the Magical Research Presentation festival. Arata, in particular, would instantly becoming aware of her presence, as well as becoming strangely allured to her. However, they would not formally meet until after Anna helped him recover from suddenly fainting (although she would later be revealed to be the cause). Nevertheless, Anna and Arata would easily get along with one another during their initial meeting, even begin calling each other's first names. Notably, Arata has a visible attraction towards Anna, becoming very conscious and embarrassed towards her, especially during any forms of contact. Anna also appears to enjoy his company as well, commonly treating him in a polite and flirtatious manner. Although, in spite of her affectionate treatment, Anna has described Arata as her "worst enemy", eventually forcing him under her control as her knight. Despite this, he couldn’t abandoned her when she was in trouble after regaining control of himself. Arata even forfeited his power and Demon Lord Element to stabilize her and allow her to live. This selfless act caused her to fall in love with him even more and tried to kiss him in gratitude until they were interrupted by the other girls. Anna would even later give her own life to Arata, so he can live again. Anna then confess to him that she truly loves him before she disappears from existence.
Royal Akasha Academy[]
Ayesha - As Anastasia's partner and best friend since high school, the two have been working together towards an unknown goal involving Arata, the Demon Lord Candidate. While the two get along very well with one another, Ayesha has been shown to be occasionally bewildered and even frightened by Anna's demeanor. During Anna's first encounter with Hijiri, their confrontation would intimidate Ayesha along with Lugh. Later, after Arata unexpected lost his battle in the Magical Research Showdown, Anna would act amused and nonchalant much to Ayesha's dismay. Nevertheless, the two friends care deeply for one another, able to discuss freely discuss personal matters and willing to support each other regardless of the situation. Seventeen years ago, Ayesha would congratulate Anna on becoming a Trinity Seven before happily celebrating together. However, Ayesha was concerned over Anna potentially disappearing, although Anna would reassure her friend. Furthermore, they would also converse over Anna's relationship with the Demon Lord Candidate, with Ayesha proudly declaring that the Demon Lord would fall for Anna and refuse to destroy the world for her, much to Anna's joy and embarrassment. Unfortunately, upon Anna's forced displacement from the world, Ayesha would promise to assist Anna after she returned before the two friends sadly expressed their farewells. In the present, Ayesha would reunite with Anna and the two would participate in the Magical Research Showdown Festival as teammates.
Iscariot[]
Hijiri Kasuga - Hijiri and Anastasia-L are adversaries due to their conflicting goals regarding Arata. During their first meeting, the two would greet each other as saints, before having a friendly but tense conversation concerning Arata. While, they would treat each other in a polite and cordial manner, the hostile atmosphere between them would even frighten both of their companions, Lugh and Master Akasha. Nonetheless, Anna would praise Hijiri's devotion towards Arata, much to Hijiri's surprise. However, when offered the chance to fight one another, Anna would display a belligerent and menacing demeanor, causing Hijiri to become instinctively initimidate, as well as becoming concerned for Arata after learning of her Thema.