R-ne: a cute, metallic lifeform who one day fell from space. Keiji Osaki: a young man with a hazy past, now working at a mech garage. After whiling away much of the summer together, the two of them make a promise: They're going to return R-ne to her home planet. Their plans are interrupted, though, by another couple of new arrivals to Hanma Town: the headstrong space pirates (or "rare metal hunters") Lily and Yunie. Will Keiji and his friends ever be able to return R-ne to space? And what will become of the group's budding romances?

The truth always emerges from the place you'd least expect...