Don’t let the fact there is a mecha in the opening credits fool you. m3: the dark metal is more of a drama than an action show, and it’s one of those series where what you see in the beginning doesn’t indicate anything about where you’ll be by the end.
At first glance m3 is rather by the book. An eclectic group of high schoolers are brought together in a special class to learn how to pilot the latest technological advance, a combat vehicle called a MA-Vess that is capable of exploring the mysterious Lightless Realm that is slowly swallowing the city they live in. But the story takes a much darker turn than the norm.