Jun, chosen by Metal Breath, and Bluecop seek true harmony between human and Metal Cardbot.

But one day—

A mysterious Wild Cardbot appears. A new encounter. A new destiny. Now, it shakes the world.

Jun's friend Crest, who has returned to Mou Town, brought a tablet from the 'Porcaca Ruins.' The moment Jun touched the tablet, the Metal Breath reacted, leading to new incidents.