Glass

""Are you all so threatened by these little monsters? It seems there is but one true hero among you.""

- Glass

Glass (グラス) comes from a race of spirit people. She was later revealed to be a Vassal Wielder from another world, the Fan Hero (扇の勇者). She is also best friends with Kizuna Kazayama, the Hunting Hero.

Appearance
Glass is a beautiful young woman with long black hair trimmed and styled after a traditional Japanese Princess (姫) haircut. She wears a jet black kimono with silver embroidery like those worn during a funeral. She has pale skin that is slightly translucent due to her racial characteristics as a Spirit Person.

During her third visit to Naofumi's world, she wore European-style clothing, which according to both L'Arc and Naofumi, didn't suit her at all.

Personality
Glass comes off as stern, cold, and serious. Glass holds strong loyalty when it comes to her world and Kizuna, she also takes pride in being a Vassal Wielder and Hero and has high expectations towards other heroes, friends, or foe, from her world or not.

Because of her strong loyalty to her world, she was willing to even kill the Four Legendary Heroes of another world to save her own.

She is serious in her mission and doesn't like relaxing with her friends. Later in the series, her serious expression changes when she is around Kizuna to a more friendly and joyful expression. Naofumi considered it weird for someone who was always calm and cool to have such expressions.

Background
Glass comes from a race of Spirit People, and was a disciple of a famous martial art school. Glass was chosen to undertake a trial to earn the right to become the Vassal Fan holder: fighting the Demon Dragon Emperor that ravaged the people of her home country.

Initially, Glass was denied to participate in the ceremony because of her birth (the reason for her being discriminated against was not touched upon, as Kizuna felt it too personal to share and avoided the topic). However, she was chosen after all the disciples of the school were turned down by the weapon. The disciples were bitter about Glass being chosen over them, so they cut ties with her. The disciples all thought that Glass would die in the task and hoped that they would be chosen next to wield the vassal weapon, leading to more infighting.

Kizuna was summoned as one of the legendary heroes of her world in a neighboring country and aided Glass on her adventure, as she was dispatched for the same task. Together, they fought and defeated the Demon Dragon Emperor. Later, they became very close friends and Glass moved to the country which summoned Kizuna.

After numerous events, Kizuna was trapped in an inescapable labyrinth. After this event, the Waves of Calamity began occurring. With Kizuna sealed away and the other Cardinal Heroes too ignorant to help, Glass' world was pushed to the brink of destruction.

Not knowing any other way to save her world, she researched an ancient text in L'Arc's country, which depicts the waves to be a phenomena signaling the merging of two or more worlds. It stated that to extend the life of her world, the Vassal Weapon wielders must kill the Cardinal Heroes of the world on the other side of the waves, to ensure its destruction. Glass and her comrades took it upon themselves to travel to Naofumi's summoned world to kill its legendary heroes.

Trivia

 * Glass is the only named character from her world who appeared in the original Web Novel. However Kizuna is hinted towards during the web novel, but like many major plot points hinted towards, she was probably cut.