A student at a prestigious magical academy hoping to learn about the Sky Castle per her grandfather's wish. She misjudges her new instructor Glenn as incompetent but is baffled when he reveals his true power during an attack. She and her peers play a key role in helping Glenn overcome his depression.
Glenn's entire seasonal arc is driven by his evolving responsibility toward Sistine, making her the emotional core of his journey.
Sistine strives to prove herself under Glenn's guidance and ultimately becomes his savior in battle.
Their friendship deepens from casual classmates to dependable partners who navigate academy politics together.
Initial wariness between the two graduates dissolves into mutual respect as they face common dangers during field operations.
Their relationship remains a stable background of camaraderie, supporting the main cast through academic challenges.
Re=L gradually bonds with Sistine and her peers during their shared academy life.