Yasako and Fumie ask Yasako's grandmother to cure Densuke of his potentially fatal illness. In return, Yasako must agree to an interesting, and dangerous, bargain.

A docile illegal follows the kids on a hazardous journey through the city, driven to find more of its kind.

Yasako and Isako are running from Megamass. While hiding, they discover that Densuke might be able to open a stable portal.