Comprehensive Manga: Starting from Demon Slayer: Kimetsu No Yaiba and Working as an Undercover Agent

Bind the undercover system and travel through the infinite animation world. In Demon Slayer: Kimetsu no Yaiba, he is the undercover agent of Demon Slayer in Demon Slayer Corps, Demon King Muzan. In Fairy Tail, he is Zeref's undercover agent in Fairy Tail. In Naruto, he was Uchiha Madara's undercover agent in Konoha. … But none of the bosses knew that this guy was working as a double agent in private, earning double his salary. Kanna Yuehan: "Boss, I didn't have a choice before. Now I want to be a good person." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.