True agency in an isekai setting is not found in the ability to destroy, but in the capacity to define one's own boundaries. When comparing a YPS-4 strategic deterrent to a YPS-2 combatant, the gap in destructive output is irrelevant compared to the divergence in their relationship with stability. Azusa Aizawa treats power as a fence, using her nation-level capabilities to curate a static, domestic paradise. For her, the lack of growth is the goal. She kills slimes for centuries not to ascend, but to anchor herself in a predictable routine. Conversely, Rem's journey is defined by the friction of inadequacy. Her strength is a tool used to compensate for a perceived defect relative to her sister, making her YPS-2 status a source of psychological torment rather than a utility. While Azusa weaponizes strength to enforce stillness, Rem is forced into a volatile evolution by the demands of her loyalty to Subaru. This comparison breaks down if viewed as a combat trial, but as a study of the self, it exposes a sharp irony: the character with the capacity to rewrite the map is the one most terrified of change, while the character bounded by the world's physics is the one pushed toward a radical reconstruction of her identity. One finds freedom in the absence of ambition; the other finds a fragile selfhood through the agony of growth.