There is a tower that summons chosen people called “Regulars” with the promise of granting their deepest desires. Whether it be wealth, fame, authority, or something that surpasses them all—everything awaits those who reach the top.

Twenty-Fifth Bam is a boy who had only known a dark cave, a dirty cloth, and an unreachable light his entire life. So when a girl named Rachel came to him through the light, his entire world changed. Becoming close friends with Rachel, he learned various things about the outside world from her. But when Rachel says she must leave him to climb the Tower, his world shatters around him. Vowing to follow after her no matter what it takes, he sets his sight on the tower, and a miracle occurs.

Thus begins the journey of Bam, a young boy who was not chosen by the Tower but opened its gates by himself. They call his kind “Irregulars”—beings that have shaken the very foundation of the Tower each time they set foot inside it.

In a world of anthropomorphic animals, Belle Lablac was born as the only human being. Having no fangs, fur, or scales, she was called “Faceless,” and she lived a lonely life with no one else she could identify with. “I want to be part of the world…” With such longing in her heart, she decides to set out on a journey to find her roots, carrying the Runding, a great sword as tall as she is. She doesn’t know how many adversities await her along the way…