Touji Nakahara is a 35-year-old Japanese male and career criminal responsible for the fatal shooting of Kazuhito Harumi during a café robbery. After the crime, Nakahara takes up residence in Kazuhito's vacant apartment. While living there, he develops a profound interest in literature, avidly reading novels by Kirihime Natsuno, published under her pen name Shinobu Akiyama. He becomes especially engrossed in her "Seven Deadly Sins" series.

Nakahara adopts a distinctive fighting method directly derived from Natsuno's literary concepts, wielding the thick volumes of the "Seven Deadly Sins" books as both blunt weapons for striking opponents and as makeshift armor to shield himself in combat. This unique style stems from his deep immersion in her work. His actions culminate in a confrontation with Natsuno herself, who defeats him and suspends him from a bridge.

Despite Natsuno urging Kazuhito, who was reincarnated as a dog, to take vengeance for his death, Kazuhito chooses to spare Nakahara. This decision reflects Kazuhito's character and his own appreciation for literature, recognizing Nakahara's shared passion for reading. Following this encounter, Nakahara is apprehended by the police.