: In 992 AD, an alien race called the Kotona invaded Earth, nearly driving humanity to extinction. In 1010 AD, humanity discovered Douryoku , a power that allowed them to fight back.
: By 1330 AD, the Kotona were thought to be wiped out, but specialized academies were established to ensure humanity remained prepared for their inevitable return. Plot and Protagonist koiken-otome
: Another major character who has a dedicated route focusing on her personal growth and relationship with Seiichi. : In 992 AD, an alien race called