The Devil Is Sealed, My Wandering Story

Demon King: "A mere brave man is not enough to compete with me." After being beheaded by a brave man: "The strength is indeed strong, but it still can't kill me." After being sealed by the brave: "I don't want to be sealed yet, who will save me?" Protagonist: "I'm here to save you, but it may take a few hundred million seconds." Demon King: "My power is transferred to you, but you must find a chance to break the seal and rescue me." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.