Glass comes from a race of Sprite People. She obtained the Vassal Fan somewhere down the line and became the Fan Hero. When Kizuna was summoned as one of the legendary heroes of her world, she aided her on her adventure and help her defeat the Dragon Emperor becoming a very close friend.
After some numerous events, Kizuna was trapped in an inescapable labyrinth. Glass' world on the verge of being destroyed and not knowing any other way to save her world, she took it upon herself to travel to Naofumi's summoned world and kill the legendary heroes to stop the world from merging together.
