One day, just before the Golden Week holidays. The twin sisters are on their way to school when they are suddenly kidnapped by strange men. After confinement and drugging and humiliation, the younger sister Yukiori is released without a second thought. However, she has already fallen into a state where…

Yggdrasil, also known as “The Tower of God”, is a giant tower that reaches all the way to the clouds. It is commonly believed among explorers that weapons of all kinds can be found within the tower. One day, a kind-hearted explorer named Mei rescues an armless man during a…