TV-Series
Description
Tiese Schtrinen, a noble from a sixth-class family in the Norlangarth North Empire, enrolled at the Sword Mastery Academy to elevate her family's status. Ranked among the top twelve students of her year, she became Eugeo's valet, believing her selection stemmed from proficiency in Sacred Arts over swordsmanship. Slender with rare long red hair, Tiese possessed a diligent, positive, and dedicated personality, often described as lively and motivated. She developed deep admiration and romantic feelings for Eugeo, proposing marriage should he gain noble status via the Four Empires Unity Tournament.

At the academy, Tiese and her close friend Ronye Arabel confronted Elite Disciples Raios Antinous and Humbert Zizek over their abuse of valet Frenica Szeski. This resulted in Tiese and Ronye's unlawful detention under false accusations of disrespect. Raios and Humbert escalated the situation by attempting to assault them as punishment, exploiting imperial law loopholes. Eugeo and Kirito intervened, violating the Taboo Index to rescue the pair, causing severe consequences for the mentors. Following this, Tiese vowed to become an Integrity Knight to save Eugeo and Kirito.

When war erupted against the Dark Territory, Tiese volunteered for the Human Guardian Army's supply unit. Learning from Alice Synthesis Thirty of Eugeo's death and Kirito's catatonic state, she collapsed emotionally. Later, touching Eugeo's Blue Rose Sword, she perceived his consoling voice within its memories. She subsequently witnessed Kirito's recovery during the battle against PoH.

After the war, Tiese and Ronye became apprentice Integrity Knights. Tiese inherited Eugeo's knight number, 32, and received the Blue Rose Sword from Kirito as a keepsake. Integrity Knight Renly Synthesis Twenty-Seven proposed; Tiese initially hesitated due to unresolved feelings for Eugeo but eventually married him and had a child. To synchronize her lifespan with Renly, who could not age, she employed a spell freezing her physical age in her mid-twenties.

Approximately 200 years later, Tiese, Ronye, and Selka Zuberg used a stone-freezing spell to enter suspended animation within Central Cathedral. Kirito and Alice awakened them upon returning to Underworld. Around 50 years after freezing her age, Tiese encountered her descendant, Stika Schtrinen, who bore a resemblance to Eugeo. Throughout her extended life, she maintained her role as a guardian of Underworld, later participating in initiatives like the monster countermeasures team and continuing her family's noble legacy.