Glass is one of the Sprite People, a race native to her world. She's best known for wielding the Vassal Fan and becoming the Fan Hero—one of the legendary heroes of her realm. When Kizuna was summoned as a legendary hero, Glass fought alongside her and helped take down the Dragon Emperor, and the two became genuinely close friends.
Things got complicated later. Kizuna ended up trapped in an inescapable labyrinth, and Glass's entire world started collapsing. Facing what seemed like no other option, Glass made the decision to travel to Naofumi's world with a grim purpose: to kill the legendary heroes there, hoping it would stop the worlds from merging and destroying her own.
Content compiled by AnimeList.moe from publicly available sources.
