u/Infamous-Quality-185

Does anyone know the name of the manga where the protagonist returns from an isekai with all his powers and abilities after defeating the Demon King? But when he returns, he tries to lead a normal life in high school, until he, his sister, and his classmates are kidnapped on a bus in a style similar to the manga Battle Royale. That’s when the protagonist uses his abilities to get rid of everyone involved... etc. (Sorry, I’m using a translator.)