When 'Armed Librarians' launch an attack against a 'Church of Shindeki' ship they are attacked by 'Human Bombs'. After boarding the ship and fighting off the guards (the Mock Men), the Librarians find dozens of 'Meats' in the hold but are unable to save them all before the ship itself explodes. One of the few survivors is the Human Bomb, Colio Tonies whose only thoughts are of killing the Acting-Director of the Armed Librarians, Hamyutz Meseta.

Colio and his companions find themselves at the Toatt Mine region still searching for Hamyutz. However it isn't long before Lumion, a local Armed Librarian discovers that they are human bombs. In the ensuing confusion one of the bombs detonates killing Lumion and this in turn prompts Hamyutz herself to head to the Toatt Mine to search for those responsible.

Colio is given another piece of the book of the Ever-Laughing Witch and he learns more about her past. He also comes face to face with the women he is supposed to kill but things do not go as he thought they would.

Hamyutz and Cigal finally face each other in battle but with Cigal wielding Shlamuffen it doesn't seem like the Acting-Director has much hope of winning. Meanwhile, after learning more about Shiron's past, Colio decides that he too must fight.

Following the theft of Ylucklucu and Volken's apparent betrayal everyone at Bantorra begins to question his motives and his character. Mirepoch has been particularly affected by her friend's actions and seeks solace in the books of the lower libraries. Meanwhile, Nototy is dispatched to recover Lumion's book which has gone missing from the Toatt Mine.

A man who refers to himself a monster arrives at the Library and demands to see Hamyutz. He is immediately confronted by Mattalast, Minth and Mirepoch who manage to force him to retreat despite his numerous magical abilities. Meanwhile, Noloty is still investigating the theft of Lumion's book.