Please Let Me Show You the Demon

My brother is in trouble, should I save him or not? Should I accept the mission of assassinating the Demon Clan Wind Wing King or not? If the demon clan bullies the human clan in front of them, should they kill them or not? The demon court is unruly, are you fellow members of the same clan the opposite or the opposite? A time traveler from Blue Star, carrying a three-page book without words, wandered into this continent ruled by the demon clan. He wanted to lie down, but he unknowingly became the hope of mankind.