Tomoe Inui is a petite mystic wolf beastman with white hair, suntanned skin, purple eyes, wolf ears, and a fluffy tail. Her northern homeland was destroyed by the Demon Lord's Domain, forcing her to flee as a refugee to the Kingdom of Elfrieden with her mother, Tomoko, and younger brother, Rou, after her father succumbed to illness. Arriving in worn, frayed clothing, she initially displayed extreme timidity, social anxiety, and stuttered speech, especially under pressure like presenting her unique dark magic ability to speak with animals before the royal court.

This telepathic power translates the feelings and languages of animals and demons. Its revelation, particularly the capability to understand demons during a public ceremony, prompted immediate protective measures from the monarchy due to political sensitivity. To safeguard her, former King Albert and Queen Elisha formally adopted Tomoe, integrating her into the royal family as the adoptive younger sister of Crown Princess Liscia and future sister-in-law to Kazuya Souma. Her biological family received palace protection. Tomoe initially objected over concerns for her mother but accepted the primarily formal adoption after reassurances.

Residing in the palace, Tomoe became more outgoing and courageous, actively seeking to justify the trust placed in her. Though lingering shyness and discomfort with attention persist, she steadily confronts these challenges. Her responsibilities expanded to include accompanying key figures on diplomatic missions to locations like the Republic of Turgis and the Nine Headed Dragon Archipelago, always under the protection of her Black Cats bodyguard, Beowulf, whom she views as a father figure due to his mentorship.

Academically, she excels at the Royal Academy under Hakuya Kwonmin's tutelage, later joined by peers including Ichiha Chima and Yuriga Haan. While not considered Hakuya's natural intellectual successor, she achieved high entrance exam scores placing her in the top class. Her royal status contributes to her challenging popularity within the academy.

Her abilities proved strategically vital. During the demon wave crisis in the Union of Eastern Nations, her communication with a hostile lizardman in Lastania uncovered their motives, enabling effective countermeasures. In the Duchy of Chima, her razor-sharp instincts led to discovering Ichiha Chima, whose talents she recognized and brought to leadership attention. While enrolled at the academy, she maintains friendships with Ichiha, Yuriga, Lucy Evans, and Velza. Her story intertwines personal growth from a traumatized refugee to a confident student and valued asset with ongoing contributions to state affairs through her unique magical capabilities and diplomatic involvement.