Glass/Chronology

Volume 3
She first appeared on the third Wave and was mistaken as the boss of the Wave by the Four Legendary Heroes. She later disregards The Spear Hero, The Sword Hero, and The Bow Hero as fools, extremely weak, common adventures & not heroes. She only accepts Naofumi as the only true hero among them due to the events of Naofumi single handily defeating the Soul Eater on his own. She defeated three of the Heroes without breaking any sweat.

Glass challenges Naofumi to a duel and wasn't taking no as an answer. During the fight, she questions Naofumi why he wasn't using the flame shield which she saw him use before killing the Soul Eater. Because of that, she felt like she was being mocked at and looked down upon by Naofumi. Later, she was forced to retreat during her fight, due to her running out of time.

Volume 5
She appears again to aid L'Arc and Therese against their fight with Naofumi. Once again Glass and her allies were forced to retreat due to them running out of time. But acknowledged Naofumi to be a greater threat, as he grew much stronger in a short amount of time.

Volume 7
Due to Kyo, The Book Hero causing Havoc in Naofumi's World by controlling the Spirit Tortoise which was strictly forbidden, she was ordered by her Vassal Weapon to track down and kill Kyo. Glass and Naofumi having a common goal in mind, she formed an alliance with Naofumi to defeat The Book Hero.

Volume 8
After reuniting with her long lost comrade and friend, she was punished by Kizuna for trying to kill Naofumi and the other legendary Heroes. Glass and her comrade later became good friends with Naofumi and his party.