To ensure humanity is safeguarded from the virus named “Torikago,” the young girl Kiri has hidden the precious “World’s Memory” within her body, all while living a normal existence. This world is both cherished by and hostile towards the Torikago virus. And as time goes on, Kiri's own memories slowly fade due to her lack of free will, yet she still manages to fall in love. Amidst the chaos, one can't help but question why such an important task was placed on people like them to maintain global harmony.