Having recovered a treasure chest from a sinking ship, the Straw Hat Pirates can’t wait to see what riches await them inside. So imagine their surprise when they find they've gotten an old lady instead! Anxious to get back home (and avoid Nami’s wrath for having thrown out the treasure previously in the chest), the old lady offers a great treasure reward if the crew will return her to her home on Mecha Island. Her legend of the Golden Crown sounds too good to be true… but Luffy smells adventure, so what's the crew to do? In an island full of amazing inventions, the crew will test their riddle-solving skills – and Luffy's dumb luck – to solve the mystery of Mecha Island and its treasure.
Simon lives a boring life in the underground village of Jeeha, where his main job day in and day out is to dig tunnels. His close friend Kamina, however, longs to bust out of their oppressive existence and reach the surface world where open skies and adventure await! One day, during his usual digs, Simon discovers a robot with a big face buried amongst the rocks. No sooner has he shown Kamina his mysterious find when two beings from the surface crash land into Jeeha Village - one is a gun-toting woman calling herself Yoko and the other is a terrifying mecha piloted by a Beastman! Seeing their chance to escape village drudgery, Kamina rallies Simon and Yoko to defeat the invader using their new robot, Lagann. However, upon breaking out onto the surface world, Simon, Kamina, and Yoko encounter enemies more powerful than they could have envisioned. Their fight for adventure just turned into a war for the survival of the human race - will their lust for freedom hold out against such terrible odds?
If you are interested in seeing more real action involving robots with drills, TTGL is the anime for you. It is not as cracky and funny as One Piece (but then again, what is?), but a pretty decent series by itself, with devoted heroes, a developing plot and all kinds of awesome moments.