While scavenging, Echo encounters a strange girl with amnesia who changes his life as they become fast friends.

Echo and Mu try to run from the aftermath of their first battle against the Earless, but are once again ambushed. The three mysterious women chasing them are not far behind.

An unexpected rescue is made by people Echo recognises from the players almanac. Mu learns more about the Core Part in her possession, and about the war that happened ten years ago.

Echo and Mu head to Freak Science Academy to research Jimi Stonefree's history, but the school's director asks them for help with something else.

The trail to uncover the mystery of Jimi Stonefree leads Echo and Mu to a glittering purple city ruled by Denka.

Echo and Mu follow Jimi to Gnome Country, where they learn the fate of the people betrayed by the rest of the world.