Damn It, I Got the Oath Account Book as Soon as I Came Up.

A mysterious girl gave a blank black notebook to the boy. The boy opened his notebook and felt a sharp pain in his head. "What is this notebook? Why do I get a headache when I open it?" "This is an account book, and what is written on it are all the agreements you owe..." "So... What do you mean?" "It's only natural to pay back debts." "This..." From then on, the young man embarked on a journey to repay his debt... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.