The plot of a juvenile comic about travelers from another world saving the world seems good, but the purpose of this group of people is quite impure. Is it a problem to leave the world to them? "To collect weapons." "For my justice." "To kill others." "To train students." "To avenge my father!" Is that really okay? Will the world be destroyed? I think it would be more practical to let these people run amok in the world than to bombard them and rebuild them.