A shy high school girl's life changes when she meets her school's new student - a beastfolk teen. Despite initial nervousness and social prejudices, she discovers a deep connection with him that grows into something more.

Hatori Chise, 15 years old. Lost, without hope and without family - she sells herself to a non-human mage known as Elias Ainsworth. Hesitant, she starts a new life with him as his new apprentice.

Inside a vast, self-replicating city bent on eliminating all life, mysterious loner Killy emerges to guide a remnant of humanity desperate to survive.