Hell Song: the Strongest Monster Hunter

The protagonist accidentally travels to the dark world of "Hellsing", where vampires and monsters are rampant, and the war between humans and supernatural forces never ends. The Hellsing organization protects Britain, but it hides unknown secrets, and Accardo, as the ultimate monster, controls power beyond life and death. Kailan accidentally traveled into the world of "Hell Song". Due to an unfortunate incident, he was full of resentment against monsters and vowed to eliminate all monsters. Accardo: "Fear me, human! You will never kill me!" Kailan: "I will, monster. Fear is the instinct of creatures, and courage is the hymn of mankind!"