Middle school student and bully victim Yuuya Tenjou's life changes when he discovers a portal to another world.

The world is in mortal peril. A high school boy has suddenly given a mission of finding the princess Samidare and protecting the planet from incredible "Biscuit Hammer".

Madness and unawakening sleep, Randolph syndrome. This new illness is slowly but steadily approaching humanity, caused by the huge underground world Asylum that appeared in Antarctica. There are strange creatures different from the earth, and unknown resources. People bet their lives on the depths of the mysterious new world to get huge wealth, organizational plots, or their own ambitions. Here alone, a young man with a wish in his heart is trying to challenge the front line of Asylum.